The Experts below are selected from a list of 10020 Experts worldwide ranked by ideXlab platform
Gary J. Samuels - One of the best experts on this subject based on the ideXlab platform.
-
STUDIES IN MYCOLOGY 50: 401–407. 2004. 401 Hypocrea flaviconidia, a new species from Costa Rica with yellow conidia
2015Co-Authors: Irina S. Druzhinina, Priscila Chaverri, Payam Fallah, Christian P. Kubicek, Gary J. SamuelsAbstract:Abstract: The new species Hypocrea flaviconidia and its Pachybasium-like Trichoderma anamorph are described based on collections from the Southern region of Costa Rica. This species is distinguished by its yellow conidia, a character that is rare and unusual in Hypocrea/Trichoderma. The phylogenetic relationship of H. flaviconidia to other species of Hy-pocrea/Trichoderma is explored based on ITS1 and 2 regions of rDNA, tef1 and ech42 gene genealogies. Phylogenetic analyses show that H. flaviconidia belongs in Trichoderma sect. Trichoderma, where it forms a sister group to a clade that includes T. hamatum and T. pubescens. A key to species of Hypocrea with known Anamorphs with yellow conidia is pre-sented
-
delimitation of neonectria and cylindrocarpon nectriaceae hypocreales ascomycota and related genera with cylindrocarpon like Anamorphs
Studies in Mycology, 2011Co-Authors: Priscila Chaverri, Amy Y. Rossman, C Salgado, Yuuri Hirooka, Gary J. SamuelsAbstract:Neonectria is a cosmopolitan genus and it is, in part, defined by its link to the anamorph genus Cylindrocarpon. Neonectria has been divided into informal groups on the basis of combined morphology of anamorph and teleomorph. Previously, Cylindrocarpon was divided into four groups defined by presence or absence of microconidia and chlamydospores. Molecular phylogenetic analyses have indicated that Neonectriasensu stricto and Cylindrocarponsensu stricto are phylogenetically congeneric. In addition, morphological and molecular data accumulated over several years have indicated that Neonectria sensu lato and Cylindrocarponsensu lato do not form a monophyletic group and that the respective informal groups may represent distinct genera. In the present work, a multilocus analysis (act, ITS, LSU, rpb1, tef1, tub) was applied to representatives of the informal groups to determine their level of phylogenetic support as a first step towards taxonomic revision of Neonectriasensu lato. Results show five distinct highly supported clades that correspond to some extent with the informal Neonectria and Cylindrocarpon groups that are here recognised as genera: (1) N. coccinea-group and Cylindrocarpon groups 1 & 4 (Neonectria/Cylindrocarponsensu stricto); (2) N.rugulosa-group (Rugonectria gen. nov.); (3) N. mammoidea/N. veuillotiana-groups and Cylindrocarpon group 2 (Thelonectria gen. nov.); (4) N. radicicola-group and Cylindrocarpon group 3 (Ilyonectria gen. nov.); and (5) anamorph genus Campylocarpon. Characteristics of the Anamorphs and teleomorphs correlate with the five genera, three of which are newly described. New combinations are made for species where their classification is confirmed by phylogenetic data.
-
Cyanonectria, a new genus for Nectria cyanostoma and its Fusarium anamorph
Mycological Progress, 2008Co-Authors: Gary J. Samuels, Jacques Fournier, Priscila Chaverri, Francoise Candoussau, Amy Y. RossmanAbstract:The new genus Cyanonectria is proposed for Nectria cyanostoma (≡ Cyanonectria cyanostoma comb. nov.). This genus is characterized by Nectria-like, red perithecia that have a bluish-purple papilla and a Fusarium anamorph. DNA sequences (large subunit and internal transcribed spacers of the nuclear rDNA) indicate that C. cyanostoma is not closely related to Nectria sensu stricto. In addition, the phylogenetic data also show that the closest relatives for Cyanonectria also have Fusarium Anamorphs.
-
Reconsideration of Protocrea (Hypocreales, Hypocreaceae).
Mycologia, 2008Co-Authors: Walter M. Jaklitsch, Kadri Põldmaa, Gary J. SamuelsAbstract:The genus Protocrea is redefined, based on holotype and fresh specimens of its type species P. farinosa, using morphology of teleomorph and anamorph and phylogenetic analyses of rpb2 sequences. Data based on currently available specimens suggest the existence of three well defined and three still unnamed species. Apart from the type, P. farinosa, none of the species originally included are accepted in the genus. Species of Protocrea are characterized by perithecia formed in or on a subiculum, bicellular ascospores that disarticulate at the septum while still in the ascus and by Anamorphs belonging to Gliocladium sensu stricto. For Hypocrea farinosa sensu auct. the new species H. decipiens is introduced. Hypocrea pallida is recognized as a species of Protocrea. It is closely related to P. farinosa, morphologically, phylogenetically and by habit. Protocrea illinoensis is described here as the sister taxon of P. farinosa found in the USA. All species are polyporicolous, with the principal hosts Skeletocutis ...
-
Hypocrea rufa/Trichoderma viride: a reassessment, and description of five closely related species with and without warted conidia
Studies in Mycology, 2006Co-Authors: Walter M. Jaklitsch, Gary J. Samuels, Sarah L. Dodd, Irina S. DruzhininaAbstract:The type species of the genus Hypocrea (Hypocreaceae, Hypocreales, Ascomycota, Fungi), H. rufa, is re-defined and epitypified using a combination of phenotype (morphology of teleomorphs and Anamorphs, and characteristics in culture) and phylogenetic analyses of the translation-elongation factor 1α gene. Its anamorph, T. viride, the type species of Trichoderma, is re-described and epitypified. Eidamia viridescens is combined as Trichoderma viridescens and is recognised as one of the most morphologically and phylogenetically similar relatives of T. viride. Its teleomorph is newly described as Hypocrea viridescens. Contrary to frequent citations of H. rufa and T. viride in the literature, this species is relatively rare. Although both T. viride and T. viridescens have a wide geographic distribution, their greatest genetic diversity appears to be in Europe and North America. Hypocrea vinosa is characterised and its anamorph, T. vinosum sp. nov., is described. Conidia of T. vinosum are subglobose and warted. The new species T. gamsii is proposed. It shares eidamia-like morphology of conidiophores with T. viridescens, but it has smooth, ellipsoidal conidia that have the longest L/W ratio that we have seen in Trichoderma. Trichoderma scalesiae, an endophyte of trunks of Scalesia pedunculata in the Galapagos Islands, is described as new. It only produces conidia on a low- nutrient agar to which filter paper has been added. Additional phylogenetically distinct clades are recognised and provisionally delimited from the species here described. Trichoderma neokoningii, a T. koningii-like species, is described from a collection made in Peru on a fruit of Theobroma cacao infected with Moniliophthora roreri.
Pedro W. Crous - One of the best experts on this subject based on the ideXlab platform.
-
STUDIES IN MYCOLOGY 55: 235–253. 2006. Phylogenetic lineages in the Botryosphaeriaceae
2013Co-Authors: Pedro W. Crous, Artur Alves, Michael J. Wingfield, John Rheeder, Walter F. O. Marasas, Alan J. L, Treena Burgess, Paul Barber, Johannes Z GroenewaldAbstract:Abstract: Botryosphaeria is a species-rich genus with a cosmopolitan distribution, commonly associated with dieback and cankers of woody plants. As many as 18 anamorph genera have been associated with Botryosphaeria, most of which have been reduced to synonymy under Diplodia (conidia mostly ovoid, pigmented, thick-walled), or Fusicoccum (conidia mostly fusoid, hyaline, thin-walled). However, there are numerous conidial Anamorphs having morphological characteristics intermediate between Diplodia and Fusicoccum, and there are several records of species outside the Botryosphaeriaceae that have Anamorphs apparently typical of Botryosphaeria s.str. Recent studies have also linked Botryosphaeria to species with pigmented, septate ascospores, and Dothiorella Anamorphs, or Fusicoccum Anamorphs with Dichomera synAnamorphs. The aim of this study was to employ DNA sequence data of the 28S rDNA to resolve apparent lineages within the Botryosphaeriaceae. From these data, 12 clades are recognised. Two of these lineages clustered outside the Botryosphaeriaceae, namely Diplodia-like Anamorphs occurring on maize, which are best accommodated in Stenocarpella (Diaporthales), as well as an unresolved clade including species of Camarosporium/Microdiplodia. We recognise 10 lineages within the Botryosphaeriaceae, including an unresolved clade (Diplodia/Lasiodiplodia/Tiarosporella), Botryosphaeri
-
Molecular phylogeny of Phoma and allied anamorph genera: towards a reclassification of the Phoma complex.
Mycological research, 2009Co-Authors: J. De Gruyter, Maikel M Aveskamp, Joyce H C Woudenberg, Gerard J M Verkley, Johannes Z Groenewald, Pedro W. CrousAbstract:The present generic concept of Phoma is broadly defined, with nine sections being recognised based on morphological characters. Teleomorph states of Phoma have been described in the genera Didymella, Leptosphaeria, Pleospora and Mycosphaerella, indicating that Phoma Anamorphs represent a polyphyletic group. In an attempt to delineate generic boundaries, representative strains of the various Phoma sections and allied coelomycetous genera were included for study. Sequence data of the 18S nrDNA (SSU) and the 28S nrDNA (LSU) regions of 18 Phoma strains included were compared with those of representative strains of 39 allied anamorph genera, including Ascochyta, Coniothyrium, Deuterophoma, Microsphaeropsis, Pleurophoma, Pyrenochaeta, and 11 teleomorph genera. The type species of the Phoma sections Phoma, Phyllostictoides, Sclerophomella, Macrospora and Peyronellaea grouped in a subclade in the Pleosporales with the type species of Ascochyta and Microsphaeropsis. The new family Didymellaceae is proposed to accommodate these Phoma sections and related anamorph genera. The present study demonstrated that Phoma radicina, the type species of Phoma sect. Paraphoma and Phoma heteromorphospora, the type species of Phoma sect. Heterospora can be assigned to the Phaeosphaeriaceae and Leptosphaeriaceae respectively.
-
Foliicolous Mycosphaerella spp. and their Anamorphs on Corymbia and Eucalyptus
Fungal Diversity, 2007Co-Authors: Pedro W. Crous, Brett A. Summerell, Angus J. Carnegie, Caroline Mohammed, W. Himaman, Johannes Z GroenewaldAbstract:The genus Eucalyptus is host to numerous species of Mycosphaerella, several of which are only known as Anamorphs, and for which no Mycosphaerella state is known. In this study new Mycosphaerella teleomorph states are described for Nothostrasseria dendritica and Trimmatostroma excentrica. Two new hyphomycete genera are introduced. Of these, Cibiessia gen. nov., with three new species accommodates an arthoconidial synanamorph of Readeriella. Phaeothecoidea gen. nov. is described for species with brown, thick-walled endoconidia. Four additional new species of Mycosphaerella are introduced with several new anamorph species described in Dissoconium, Phaeophleospora, Pseudocercospora, Ramularia and Stenella. Furthermore, an epitype is designated for Mycosphaerella molleriana. This study also presents new Eucalyptus host and distribution records including M. mexicana from Hawaii, M. ohnowa from Australia, M. acaciigena from Australia and Venezuela, M. heimii from Venezuela and Thailand, M. konae from Venezuela, and M. thailandica from Thailand.
-
Phylogenetic lineages in the Botryosphaeriaceae
Studies in mycology, 2006Co-Authors: Pedro W. Crous, Artur Alves, Paul R. Barber, Bernard Slippers, Michael J. Wingfield, John Rheeder, Walter F. O. Marasas, Treena I. Burgess, Alan J.l. Philips, Johannes Z GroenewaldAbstract:Botryosphaeria is a species-rich genus with a cosmopolitan distribution, commonly associated with dieback and cankers of woody plants. As many as 18 anamorph genera have been associated with Botryosphaeria, most of which have been reduced to synonymy under Diplodia (conidia mostly ovoid, pigmented, thick-walled), or Fusicoccum (conidia mostly fusoid, hyaline, thin-walled). However, there are numerous conidial Anamorphs having morphological characteristics intermediate between Diplodia and Fusicoccum, and there are several records of species outside the Botryosphaeriaceae that have Anamorphs apparently typical of Botryosphaeria s.str. Recent studies have also linked Botryosphaeria to species with pigmented, septate ascospores, and Dothiorella Anamorphs, or Fusicoccum Anamorphs with Dichomera synAnamorphs. The aim of this study was to employ DNA sequence data of the 28S rDNA to resolve apparent lineages within the Botryosphaeriaceae. From these data, 12 clades are recognised. Two of these lineages clustered outside the Botryosphaeriaceae, namely Diplodia-like Anamorphs occurring on maize, which are best accommodated in Stenocarpella (Diaporthales), as well as an unresolved clade including species of Camarosporium/Microdiplodia. We recognise 10 lineages within the Botryosphaeriaceae, including an unresolved clade (Diplodia/Lasiodiplodia/Tiarosporella), Botryosphaeria s.str. (Fusicoccum Anamorphs), Macrophomina, Neoscytalidium gen. nov., Dothidotthia (Dothiorella Anamorphs), Neofusicoccum gen. nov. (Botryosphaeria-like teleomorphs, Dichomera-like synAnamorphs), Pseudofusicoccum gen. nov., Saccharata (Fusicoccum- and Diplodia-like synAnamorphs), "Botryosphaeria" quercuum (Diplodia-like anamorph), and Guignardia (Phyllosticta Anamorphs). Separate teleomorph and anamorph names are not provided for newly introduced genera, even where both morphs are known. The taxonomy of some clades and isolates (e.g. B. mamane) remains unresolved due to the absence of ex-type cultures. Taxonomic novelties: Neofusicoccum Crous, Slippers & A.J.L. Phillips gen. nov., Neofusicoccum andinum (Mohali, Slippers & M.J. Wingf.) Mohali, Slippers & M.J. Wingf. comb. nov., Neofusicoccum arbuti (D.F. Farr & M. Elliott) Crous, Slippers & A.J.L. Phillips comb. nov., Neofusicoccum australe (Slippers, Crous & M.J. Wingf.) Crous, Slippers & A.J.L. Phillips comb. nov., Neofusicoccum eucalypticola (Slippers Crous & M.J. Wingf.) Crous, Slippers & A.J.L. Phillips comb. nov., Neofusicoccum eucalyptorum (Crous, H. Smith & M.J. Wingf.) Crous, Slippers & A.J.L. Phillips comb. nov., Neofusicoccum luteum (Pennycook & Samuels) Crous, Slippers & A.J.L. Phillips comb. nov., Neofusicoccum macroclavatum (Burgess, Barber & Hardy) Burgess, Barber & Hardy comb. nov., Neofusicoccum mangiferae (Syd. & P. Syd.) Crous, Slippers & A.J.L. Phillips comb. nov., Neofusicoccum parvum (Pennycook & Samuels) Crous, Slippers & A.J.L. Phillips comb. nov., Neofusicoccum protearum (Denman & Crous) Crous, Slippers & A.J.L. Phillips comb. nov., Neofusicoccum ribis (Slippers, Crous & M.J. Wingf.) Crous, Slippers & A.J.L. Phillips comb. nov., Neofusicoccum viticlavatum (Niekerk & Crous) Crous, Slippers & A.J.L. Phillips comb. nov., Neofusicoccum vitifusiforme (Niekerk & Crous) Crous, Slippers & A.J.L. Phillips comb. nov., Neoscytalidium Crous & Slippers gen. nov., Neoscytalidium dimidiatum (Penz.) Crous & Slippers comb. nov., Pseudofusicoccum (Mohali, Slippers & M.J. Wingf.) Mohali, Slippers & M.J. Wingf. gen. nov., Pseudofusicoccum stromaticum
-
New genera in the Calosphaeriales: Togniniella and its anamorph Phaeocrella, and Calosphaeriophora as anamorph of Calosphaeria
Studies in Mycology, 2004Co-Authors: Martina Réblová, Walter Gams, Lizel Mostert, Pedro W. CrousAbstract:During a survey of perithecial ascomycetes in New Zealand, two collections of a Togninia-like fungus were made on decayed wood. In culture, colonies produced a Phaeoacremonium-like anamorph. In order to reveal the phylogenetic relationships of the unknown fungus and its affinity to Togninia and other genera in the Calosphaeriales, sequences of nuclear LSU and SSU ribosomal DNA were obtained of several members of this order. These data, supported by morpho- logical and cultural characteristics, confirm that the New Zealand fungus represents a new genus very close to Calosphaeria. The genus Togniniella is proposed here to accommodate these collections, while Phaeocrella is established for their ana- morphs. Furthermore, Calosphaeria pulchella was found to form a distinct Acremonium-like anamorph in culture, for which the genus Calosphaeriophora is proposed. Pleurostoma with Pleurostomophora Anamorphs is a sister genus to the above two genera, forming the Pleurostomataceae. Togninia with its Phaeoacremonium Anamorphs, together with Jobellisia, are closer to the Diaporthales, and deserve the rank of family, for which Togniniaceae is proposed. The presence of significantly different Anamorphs in the Calosphaeriales, as well as obvious differences in teleomorph morphology of species accommo- dated in Calosphaeria, suggest that both the Calosphaeriales and Calosphaeria as presently perceived, are polyphyletic. Taxonomic novelties: Calosphaeriophora Reblova, L. Mostert, W. Gams & Crous gen. nov., Calosphaeriophora pulchella Reblova, L. Mostert, W. Gams & Crous sp. nov., Phaeocrella Reblova, L. Mostert, W. Gams & Crous gen. nov., Phaeocrella acerosa Reblova, L. Mostert, W. Gams & Crous sp. nov., Pleurostomataceae Reblova, L. Mostert, W. Gams & Crous fam. nov., Togniniaceae Reblova, L. Mostert, W. Gams & Crous fam. nov., Togniniella Reblova, L. Mostert, W. Gams & Crous gen. nov., Togniniella acerosa Reblova, L. Mostert, W. Gams & Crous sp. nov.
Brenda D Wingfield - One of the best experts on this subject based on the ideXlab platform.
-
Multigene phylogenies define Ceratocystiopsis and Grosmannia distinct from Ophiostoma
2016Co-Authors: Renate D. Zipfel, Wilhelm Z De Beer, Karin Jacobs, Brenda D WingfieldAbstract:Abstract: Ophiostoma species have diverse morphological features and are found in a large variety of ecological niches. Many different classification schemes have been applied to these fungi in the past based on teleomorph and anamorph features. More recently, studies based on DNA sequence comparisions have shown that Ophiostoma consists of different phylogenetic groups, but the data have not been sufficient to define clear monophyletic lineages represented by practical taxonomic units. We used DNA sequence data from combined partial nuclear LSU and β-tubulin genes to consider the phylogenetic relationships of 50 Ophiostoma species, representing all the major morphological groups in the genus. Our data showed three well-supported, monophyletic lineages in Ophiostoma. Species with Leptographium Anamorphs grouped together and to accommodate these species the teleomorph-genus Grosmannia (type species G. penicillata), including 27 species and 24 new combinations, is re-instated. Another well-defined lineage includes species that are cycloheximide-sensitive with short perithecial necks, falcate ascospores and Hyalorhinocladiella Anamorphs. For these species, the teleomorph-genus Ceratocystiopsis (type species O. minuta), including 11 species and three new combinations, is re-instated. A third group of species with either Sporothrix or Pesotum Anamorphs includes species from various ecological niches such as Protea infructescences in South Africa. This group also includes O. piliferum, the type species of Ophiostoma, and these species are retained in that genus. Ophiostoma is redefined to reflect the changes resulting from new combinations in Grosmannia and Ceratocystiopsis. Our data have revealed additional lineages in Ophiostoma linked to morphological characters. However
-
STUDIES IN MYCOLOGY 55: 75–97. 2006. Multi-gene phylogenies define Ceratocystiopsis and Grosmannia distinct from
2013Co-Authors: Renate D. Zipfel, Wilhelm Z De Beer, Karin Jacobs, Brenda D WingfieldAbstract:Abstract: Ophiostoma species have diverse morphological features and are found in a large variety of ecological niches. Many different classification schemes have been applied to these fungi in the past based on teleomorph and anamorph features. More recently, studies based on DNA sequence comparisions have shown that Ophiostoma consists of different phylogenetic groups, but the data have not been sufficient to define clear monophyletic lineages represented by practical taxonomic units. We used DNA sequence data from combined partial nuclear LSU and β-tubulin genes to consider the phylogenetic relationships of 50 Ophiostoma species, representing all the major morphological groups in the genus. Our data showed three well-supported, monophyletic lineages in Ophiostoma. Species with Leptographium Anamorphs grouped together and to accommodate these species the teleomorph-genus Grosmannia (type species G. penicillata), including 27 species and 24 new combinations, is re-instated. Another well-defined lineage includes species that are cycloheximide-sensitive with short perithecial necks, falcate ascospores and Hyalorhinocladiella Anamorphs. For these species, the teleomorph-genus Ceratocystiopsis (type species O. minuta), including 11 species and three new combinations, is re-instated. A third group of species with either Sporothrix or Pesotum Anamorphs includes species from various ecological niches such as Protea infructescences in South Africa. This group also includes O. piliferum, the type species of Ophiostoma, and these species are retained in that genus. Ophiostoma is redefined to reflect the changes resulting from new combinations in Grosmannia and Ceratocystiopsis. Our data have revealed additional lineages in Ophiostoma linked to morphological characters. However
-
multi gene phylogenies define ceratocystiopsis and grosmannia distinct from ophiostoma
Studies in Mycology, 2006Co-Authors: Renate Zipfel, Wilhelm Z De Beer, Karin Jacobs, Brenda D WingfieldAbstract:Ophiostoma species have diverse morphological features and are found in a large variety of ecological niches. Many different classification schemes have been applied to these fungi in the past based on teleomorph and anamorph features. More recently, studies based on DNA sequence comparisions have shown that Ophiostoma consists of different phylogenetic groups, but the data have not been sufficient to define clear monophyletic lineages represented by practical taxonomic units. We used DNA sequence data from combined partial nuclear LSU and β-tubulin genes to consider the phylogenetic relationships of 50 Ophiostoma species, representing all the major morphological groups in the genus. Our data showed three well-supported, monophyletic lineages in Ophiostoma. Species with Leptographium Anamorphs grouped together and to accommodate these species the teleomorph-genus Grosmannia (type species G. penicillata), including 27 species and 24 new combinations, is re-instated. Another well-defined lineage includes species that are cycloheximide-sensitive with short perithecial necks, falcate ascospores and Hyalorhinocladiella Anamorphs. For these species, the teleomorph-genus Ceratocystiopsis (type species O. minuta), including 11 species and three new combinations, is re-instated. A third group of species with either Sporothrix or Pesotum Anamorphs includes species from various ecological niches such as Protea infructescences in South Africa. This group also includes O. piliferum, the type species of Ophiostoma, and these species are retained in that genus. Ophiostoma is redefined to reflect the changes resulting from new combinations in Grosmannia and Ceratocystiopsis. Our data have revealed additional lineages in Ophiostoma linked to morphological characters. However, these species are retained in Ophiostoma until further data for a larger number of species can be obtained to confirm monophyly of the apparent lineages.
-
ITS rDNA phylogeny of selected Mycosphaerella species and their Anamorphs occurring on Myrtaceae
Mycological Research, 2001Co-Authors: Pedro W. Crous, Brenda D Wingfield, Li Hong, Michael J. WingfieldAbstract:Species of Mycosphaerella and their Anamorphs are commonly found on the leaves of Myrtaceae, many of which are defoliated by these pathogens. The taxonomy of these fungi has been based on minute morphological dierences, and virtually nothing is known regarding their relatedness to each other. In this study, we present a phylogeny of 30 species of Mycosphaerella or their Anamorphs from myrtaceous hosts, based on sequence data from the ITS regions of the ribosomal RNA operon. Fifteen of the species were also analysed for the 5« end of the large subunit (28S), which produced a phylogeny similar to that obtained for the ITS data set. The Mycosphaerella species included in this analysis are all regarded as representatives of section Plaga, and appear to represent a monophyletic assemblage. Mycosphaerella lateralis was the only species shown to have a wide host range. In general, species clustered together based on their anamorph genera. Species with Colletogloeopsis and Stenella Anamorphs always grouped in two respective clusters. However, species with Mycovellosiella, Phaeophleospora, Pseudocercospora and Uwebraunia Anamorphs occurred separately, suggesting that they have evolved more than once within Mycosphaerella. Based on the ITS data set, all morphospecies were also shown to be phylogenetic species, although too few isolates were available to address questions relating to intraspecies variation. Nevertheless, ITS sequence data proved sucient to distinguish morphologically similar taxa that have hitherto only been distinguished based on ascospore germination patterns and anamorph characteristics. Sequence data presented in this study should facilitate the identification of Mycosphaerella species occurring on Myrtaceae in the future.
-
xenochalara a new genus of dematiaceous hyphomycetes for chalara like fungi with apical wall building conidial development
South African Journal of Botany, 2000Co-Authors: C Coetsee, Michael J. Wingfield, P W Crous, Brenda D WingfieldAbstract:Ceratocystis autographa Bakshi is unusual amongst the ophiostomatoid fungi in that it produces two distinct anarrtorphs, typifying different teleomorph genera A chalara-like anamorph characteristic of the genus Ceratocystis sensu stricto Ellis & Halst, and a Sporothrix Hektoen & C F Perkins anamorph typical of the genus Ophiostoma Syd. & P. Syd., have been described for the fungus. In a recent study, an isolate resembling C. autographa , that was collected from Juniperus L. , was shown to have a different type of conidiogenesis to that of typical species of Chalara (Corda) Rabenh Furthermore, cycloheximide tolerance and the presence of rhamnose in the cell walls of this isolate also suggested that it was more closely related to Ophiostoma than to Ceratocystis s. str . Parsimony analysis of ribosomal DNA sequence data in this study showed that this isolate formed a monophyletic group, distinct from Ceratocystis isolates and from Ophiostoma ulmi (Buisman) Nannf The chalara-like anamorph from Juniperus is also distinct from typical Chalara Anamorphs of Ceratocystis s. str. in that it produces comdia from phialides via apical wall building, in contrast to the ring wall building typical of Chalara species. We, therefore, propose the establishment of a new genus Xenochalara gen nov., for this and other chalara-like species producing conidia by apical wall building.
Priscila Chaverri - One of the best experts on this subject based on the ideXlab platform.
-
STUDIES IN MYCOLOGY 50: 401–407. 2004. 401 Hypocrea flaviconidia, a new species from Costa Rica with yellow conidia
2015Co-Authors: Irina S. Druzhinina, Priscila Chaverri, Payam Fallah, Christian P. Kubicek, Gary J. SamuelsAbstract:Abstract: The new species Hypocrea flaviconidia and its Pachybasium-like Trichoderma anamorph are described based on collections from the Southern region of Costa Rica. This species is distinguished by its yellow conidia, a character that is rare and unusual in Hypocrea/Trichoderma. The phylogenetic relationship of H. flaviconidia to other species of Hy-pocrea/Trichoderma is explored based on ITS1 and 2 regions of rDNA, tef1 and ech42 gene genealogies. Phylogenetic analyses show that H. flaviconidia belongs in Trichoderma sect. Trichoderma, where it forms a sister group to a clade that includes T. hamatum and T. pubescens. A key to species of Hypocrea with known Anamorphs with yellow conidia is pre-sented
-
delimitation of neonectria and cylindrocarpon nectriaceae hypocreales ascomycota and related genera with cylindrocarpon like Anamorphs
Studies in Mycology, 2011Co-Authors: Priscila Chaverri, Amy Y. Rossman, C Salgado, Yuuri Hirooka, Gary J. SamuelsAbstract:Neonectria is a cosmopolitan genus and it is, in part, defined by its link to the anamorph genus Cylindrocarpon. Neonectria has been divided into informal groups on the basis of combined morphology of anamorph and teleomorph. Previously, Cylindrocarpon was divided into four groups defined by presence or absence of microconidia and chlamydospores. Molecular phylogenetic analyses have indicated that Neonectriasensu stricto and Cylindrocarponsensu stricto are phylogenetically congeneric. In addition, morphological and molecular data accumulated over several years have indicated that Neonectria sensu lato and Cylindrocarponsensu lato do not form a monophyletic group and that the respective informal groups may represent distinct genera. In the present work, a multilocus analysis (act, ITS, LSU, rpb1, tef1, tub) was applied to representatives of the informal groups to determine their level of phylogenetic support as a first step towards taxonomic revision of Neonectriasensu lato. Results show five distinct highly supported clades that correspond to some extent with the informal Neonectria and Cylindrocarpon groups that are here recognised as genera: (1) N. coccinea-group and Cylindrocarpon groups 1 & 4 (Neonectria/Cylindrocarponsensu stricto); (2) N.rugulosa-group (Rugonectria gen. nov.); (3) N. mammoidea/N. veuillotiana-groups and Cylindrocarpon group 2 (Thelonectria gen. nov.); (4) N. radicicola-group and Cylindrocarpon group 3 (Ilyonectria gen. nov.); and (5) anamorph genus Campylocarpon. Characteristics of the Anamorphs and teleomorphs correlate with the five genera, three of which are newly described. New combinations are made for species where their classification is confirmed by phylogenetic data.
-
Moelleriella zhongdongii: stroma development and identification of hirsutella-like and Aschersonia synAnamorphs.
Mycological research, 2009Co-Authors: Mariusz Tadych, Priscila Chaverri, Marshall S. Bergen, James F. WhiteAbstract:Collections of Moelleriella zhongdongii were made at the La Selva Biological Station in Costa Rica. Fresh collections were examined to evaluate developmental stages. Isolations were made from single part-ascospores and Aschersonia conidia. Moelleriella zhongdongii produces perithecia with evanescent asci and part-ascospores, and both hirsutella-like and Aschersonia synAnamorphs. Both Anamorphs were produced in pure cultures under cultural conditions optimal to induce the respective Anamorphs. Low-nutrient conditions favoured production of the hirsutella-like anamorph while high-nutrient conditions favoured development of the Aschersonia anamorph. The teleomorph developed on leaves of host plants but were not produced in vitro.
-
Cyanonectria, a new genus for Nectria cyanostoma and its Fusarium anamorph
Mycological Progress, 2008Co-Authors: Gary J. Samuels, Jacques Fournier, Priscila Chaverri, Francoise Candoussau, Amy Y. RossmanAbstract:The new genus Cyanonectria is proposed for Nectria cyanostoma (≡ Cyanonectria cyanostoma comb. nov.). This genus is characterized by Nectria-like, red perithecia that have a bluish-purple papilla and a Fusarium anamorph. DNA sequences (large subunit and internal transcribed spacers of the nuclear rDNA) indicate that C. cyanostoma is not closely related to Nectria sensu stricto. In addition, the phylogenetic data also show that the closest relatives for Cyanonectria also have Fusarium Anamorphs.
-
A monograph of the entomopathogenic genera Hypocrella, Moelleriella, and Samuelsia gen. nov. (Ascomycota, Hypocreales, Clavicipitaceae), and their aschersonia-like Anamorphs in the Neotropics
Studies in mycology, 2008Co-Authors: Priscila Chaverri, Miao Liu, Kathie T. HodgeAbstract:The present taxonomic revision deals with Neotropical species of three entomopathogenic genera that were once included in Hypocrella s. l.: Hypocrella s. str. (anamorph Aschersonia), Moelleriella (anamorph aschersonia-like), and Samuelsia gen. nov (anamorph aschersonia-like). Species of Hypocrella, Moelleriella, and Samuelsia are pathogens of scale insects (Coccidae and Lecaniidae, Homoptera) and whiteflies (Aleyrodidae, Homoptera) and are common in tropical regions. Phylogenetic analyses of DNA sequences from nuclear ribosomal large subunit (28S), translation elongation factor 1-α (TEF 1-α), and RNA polymerase II subunit 1 (RPB1) and analyses of multiple morphological characters demonstrate that the three segregated genera can be distinguished by the disarticulation of the ascospores and shape and size of conidia. Moelleriella has filiform multi-septate ascospores that disarticulate at the septa within the ascus and aschersonia-like Anamorphs with fusoid conidia. Hypocrella s. str. has filiform to long-fusiform ascospores that do not disarticulate and Aschersonia s. str. Anamorphs with fusoid conidia. The new genus proposed here, Samuelsia, has filiform to long-fusiform ascospores that do not disarticulate and aschersonia-like Anamorphs with small allantoid conidia. In addition, the present study presents and discusses the evolution of species, morphology, and ecology in Hypocrella, Moelleriella, and Samuelsia based on multigene phylogenetic analyses.
Jordi Luque - One of the best experts on this subject based on the ideXlab platform.
-
Two new species ofBotryosphaeriawith brown, 1-septate ascospores andDothiorellaAnamorphs
Mycologia, 2005Co-Authors: Alan J L Phillips, Artur Alves, Antonio Correia, Jordi LuqueAbstract:Botryosphaeria sarmentorum sp. nov. and B. iberica sp. nov. are described and illustrated. These two species are unusual in this genus because of their brown, 1-septate ascospores. Phylogenetic analysis based on ITS and EF1-α sequences place them within the clade containing species with Fusicoccum Anamorphs. The brown, 1-septate conidia, however, do not conform to Fusicoccum. Therefore phylogenetically and morphologically the Anamorphs of these two species belong in a genus distinct from any of the currently accepted anamorph genera assigned to Botryosphaeria. Through a study of the type species of Dothiorella this genus is resurrected to accommodate Anamorphs of Botryosphaeria with brown, 1-septate conidia. Botryosphaeria sarmentorum is shown to be the teleomorph of Diplodia sarmentorum, which in turn is transferred to Dothiorella. Otthia quercus is transferred to Botryosphaeria as B. quercicola nom. nov.
-
two new species of botryosphaeria with brown 1 septate ascospores and dothiorella Anamorphs
Mycologia, 2005Co-Authors: Alan J L Phillips, Artur Alves, Antonio Correia, Jordi LuqueAbstract:Botryosphaeria sarmentorum sp. nov. and B. iberica sp. nov. are described and illustrated. These two species are unusual in this genus because of their brown, 1-septate ascospores. Phylogenetic analysis based on ITS and EF1-α sequences place them within the clade containing species with Fusicoccum Anamorphs. The brown, 1-septate conidia, however, do not conform to Fusicoccum. Therefore phylogenetically and morphologically the Anamorphs of these two species belong in a genus distinct from any of the currently accepted anamorph genera assigned to Botryosphaeria. Through a study of the type species of Dothiorella this genus is resurrected to accommodate Anamorphs of Botryosphaeria with brown, 1-septate conidia. Botryosphaeria sarmentorum is shown to be the teleomorph of Diplodia sarmentorum, which in turn is transferred to Dothiorella. Otthia quercus is transferred to Botryosphaeria as B. quercicola nom. nov.