The Experts below are selected from a list of 237 Experts worldwide ranked by ideXlab platform
Adele S. Harvey - One of the best experts on this subject based on the ideXlab platform.
-
A taxonomic analysis of Jania (Corallinaceae, Rhodophyta) in south-eastern Australia
Australian Systematic Botany, 2020Co-Authors: Adele S. Harvey, J. Woelkerling, Bruno De ReviersAbstract:The genus Jania J.V.Lamour. (Corallinaceae, Corallinophycidae, Rhodophyta) is represented by five species (one with two varieties) in south-eastern Australia. Descriptions and detailed morphoanatomical accounts of these taxa are provided, along with keys, information on distribution, nomenclature and habitat, and brief biogeographic comparisons within Australia. Relevant type material is illustrated in detail. A list of 79 morphoanatomical characters and character states used by previous authors (since 1928) to delimit or identify species of Jania was compiled. Of these, nine were useful for delimiting species occurring in south-eastern Australia. Most can be delimited using a single diagnostic character, but Jania pedunculata J.V.Lamour. is highly variable and is distinguished from J. crassa J.V.Lamour. by using several overlapping characters. Twelve additional names have been recorded for south-eastern Australia. The types of seven of these were examined during the present study or in recent publications. Types of five entities could not be examined, because type material had not been designated or was not available for examination or the name was not validly published. Information on misidentified specimens, heterotypic synonyms, rejected names and unverified records for the region is also provided.
-
a monographic account of australian species of amphiroa Corallinaceae rhodophyta
Australian Systematic Botany, 2013Co-Authors: Adele S. Harvey, Wm J Woelkerling, John M. Huisman, Carlos Frederico D GurgelAbstract:The first Australia-wide monograph of Amphiroa (Corallinaceae, Rhodophyta) based on the morphological–anatomical species concept has confirmed the occurrence of nine species (A. anceps, A. beauvoisii, A. crassa, A. exilis, A. foliacea, A. fragilissima, A. gracilis, A. klochkovana, A. tribulus) and provides a basis for future molecular-systematics studies. A comparative analysis of 285 specimens from 121 localities, along with type material examinations, yielded clear evidence that nine characters associated with the vegetative system and tetrasporangial conceptacles were diagnostically significant at species level. Detailed accounts of each species are presented, along with an identification key, data on type specimens, species comparisons and biogeographic notes. A. foliacea is epitypified. Brief accounts of 34 additional taxa reported from Australia and at some stage ascribed to Amphiroa are included. Galaxaura versicolor and Amphiroa galaxauroides are heterotypic synonyms of A. anceps; recognition of A. anastomosans, A. ephedraea and A. nobilis as distinct species requires further evaluation; and A. dilatata and A. gaillonii are species of uncertain status. Amphiroa ephedraea is lectotypified. The remaining 27 names involve nomina nuda, illegitimate names, orthographic variants or taxa now excluded from Amphiroa.
-
lectotypification and epitypification of the type species of amphiroa a tribulus lithophylloideae Corallinaceae rhodophyta
Phycologia, 2012Co-Authors: William J. Woelkerling, Adele S. HarveyAbstract:Woelkerling W.J. and Harvey A. 2012. Lectotypification and epitypification of the type species of Amphora, A. tribulus (Lithophylloideae, Corallinaceae, Rhodophyta). Phycologia 51: 113–117. DOI: 10.2216/11-75.1
-
the genus amphiroa lithophylloideae Corallinaceae rhodophyta from the temperate coasts of the australian continent including the newly described a klochkovana
Phycologia, 2009Co-Authors: Adele S. Harvey, William J. Woelkerling, Alan J K MillarAbstract:Abstract Harvey A.S., Woelkerling W.J. and Millar A.J.K. 2009. The genus Amphiroa (Lithophylloideae, Corallinaceae, Rhodophyta) from the temperate coasts of the Australian continent, including the newly described A. klochkovana. Phycologia 48: 258–290. DOI: 10.2216/08-84.1 Studies of Amphiroa (Lithophylloideae, Corallinaceae, Rhodophyta) from the temperate coasts of Australia provide new evidence that differences in tetrasporangial conceptacle pore canal anatomy are diagnostically significant in delimiting species within the genus. Differences in overall morphology and genicular anatomy are also reliable for delimiting species. These data are supported by examination of relevant type specimens. Four species occur in temperate Australian waters. Three (Amphiroa anceps, Amphira beauvoisii, and the newly described Amphiroa klochkovana) occur in southeastern Australia, and three (A. anceps, A. beauvoisii, and Amphiroa gracilis) occur in southern and southwestern Australia. Comparisons of A. beauvoisii and A. ...
-
utility of psba and nssu for phylogenetic reconstruction in the corallinales based on new zealand taxa
Molecular Phylogenetics and Evolution, 2008Co-Authors: J E Broom, Adele S. Harvey, Darren R Hart, Tracy J Farr, Wendy A Nelson, Kate F Neill, William J. WoelkerlingAbstract:A number of molecular studies of the Corallinales, a calcified order of the red algae, have used the conservative nSSU gene to investigate relationships within the order. However interspecific variation at this locus is low for closely related species, limiting resolution of recently diverged groups. In this study, we obtained psbA sequence data from specimens of the order from New Zealand that had been identified according to current taxonomic criteria. We compared phylogenetic analyses based on psbA with those based on nSSU for the same dataset, and also analysed nSSU sequences of the New Zealand material with nSSU sequences of Corallinales taxa from other parts of the world. Our study shows that psbA has considerable potential as a marker for this group, being easily amplified and considerably more variable than nSSU. Combined analyses using both markers provide significant support for relationships at both distal and terminal nodes of the analysis. Our analysis supports the monophyly of all three families currently defined in Corallinales: the Sporolithaceae, Hapalidiaceae and Corallinaceae, and indicates cryptic speciation in Mesophyllum and Spongites.
William J. Woelkerling - One of the best experts on this subject based on the ideXlab platform.
-
Fossil semi-endophytic species of Lithophyllum (Corallinaceae, Rhodophyta) from Tahiti, including L. kenjikonishii sp. nov., and their taphonomic signatures
Phycologia, 2013Co-Authors: William J. Woelkerling, Yasufumi Iryu, Davide BassiAbstract:Fossil specimens of two semi-endophytic species of Lithophyllum, L. kenjikonishii sp. nov. and L. cuneatum (Corallinaceae, Rhodophyta), were discovered in thin sections of ocean floor cores of the last deglacial period (c. 20,000–10,000 years before present) obtained from Tahiti, French Polynesia, during Expedition 310 of the Integrated Ocean Drilling Program. Detailed morphological–anatomical accounts of both species are provided, and their placement in Lithophyllum and the subfamily Lithophylloideae is discussed in relation to recent classification proposals. Lithophyllum kenjikonishii, recorded only from fossil thalli, and L. cuneatum, known from fossil and nonfossil thalli, are readily distinguished in tetrasporangial conceptacle pore canal anatomy and on differences in spermatangial conceptacle chamber anatomy. Both species are semi-endophytic in Hydrolithon onkodes, another species of Corallinaceae. Taphonomic signatures evident in thin sections suggest that the occurrence of L. kenjikonishii, L. cu...
-
hydrolithon braganum sp nov Corallinaceae rhodophyta the first known exclusively fossil semi endophytic coralline red alga
Phycologia, 2012Co-Authors: William J. Woelkerling, Davide Bassi, Yasufumi IryuAbstract:Woelkerling W.J., Bassi D. and Iryu Y. 2012. Hydrolithon braganum sp. nov. (Corallinaceae, Rhodophyta), the first known exclusively fossil semi-endophytic coralline red alga. Phycologia 51: 604–611. DOI: 10.2216/11-119.1 Hydrolithon braganum sp. nov., the first known exclusively fossil semi-endophytic species of Corallinaceae (Corallinales, Rhodophyta), is based on material from Integrated Ocean Drilling Program Expedition 310 cores of last deglacial age [c. 20,000–10,000 years before present] from reef terraces around Tahiti, French Polynesia. A detailed morphological–anatomical account is provided and morphological–anatomical similarities to other species are discussed. The taxonomic position of H. braganum is problematic in relation to recent proposals for changes to the circumscription of Hydrolithon. Evidence is presented to show that the morphological–anatomical criteria proposed in recent molecular-based studies are untenable for circumscribing genera called Hydrolithon and Porolithon. Thus, pendin...
-
lectotypification and epitypification of the type species of amphiroa a tribulus lithophylloideae Corallinaceae rhodophyta
Phycologia, 2012Co-Authors: William J. Woelkerling, Adele S. HarveyAbstract:Woelkerling W.J. and Harvey A. 2012. Lectotypification and epitypification of the type species of Amphora, A. tribulus (Lithophylloideae, Corallinaceae, Rhodophyta). Phycologia 51: 113–117. DOI: 10.2216/11-75.1
-
the genus amphiroa lithophylloideae Corallinaceae rhodophyta from the temperate coasts of the australian continent including the newly described a klochkovana
Phycologia, 2009Co-Authors: Adele S. Harvey, William J. Woelkerling, Alan J K MillarAbstract:Abstract Harvey A.S., Woelkerling W.J. and Millar A.J.K. 2009. The genus Amphiroa (Lithophylloideae, Corallinaceae, Rhodophyta) from the temperate coasts of the Australian continent, including the newly described A. klochkovana. Phycologia 48: 258–290. DOI: 10.2216/08-84.1 Studies of Amphiroa (Lithophylloideae, Corallinaceae, Rhodophyta) from the temperate coasts of Australia provide new evidence that differences in tetrasporangial conceptacle pore canal anatomy are diagnostically significant in delimiting species within the genus. Differences in overall morphology and genicular anatomy are also reliable for delimiting species. These data are supported by examination of relevant type specimens. Four species occur in temperate Australian waters. Three (Amphiroa anceps, Amphira beauvoisii, and the newly described Amphiroa klochkovana) occur in southeastern Australia, and three (A. anceps, A. beauvoisii, and Amphiroa gracilis) occur in southern and southwestern Australia. Comparisons of A. beauvoisii and A. ...
-
recognition of pachyarthron and bossiella as distinct genera in the Corallinaceae subfamily corallinoideae corallinales rhodophyta
Phycologia, 2008Co-Authors: William J. Woelkerling, Alan J K Millar, Adela Harvey, Masasuke BabaAbstract:Abstract New evidence supports recognition of both Pachyarthron and Bossiella as distinct genera within the Corallinaceae, subfamily Corallinoideae (Corallinales, Rhodophyta). Pachyarthron cretaceum, the type species of Pachyarthron, is confirmed to occur in Australia, and a new study of the designated lectotype of P. cretacea and of plants from Australia, Japan, Canada (British Columbia) and the United States (Alaska, Washington State) has shown that male conceptacles are produced both axially at branch tips and laterally on intergenicula. By contrast, only lateral conceptacles occur in Bossiella. Differences between Pachyarythron and Serraticardia & Marginisporum, the only genera of Corallinoideae known to produce both axial and lateral conceptacles, are outlined, and a comparison of and key to all genera of Corallinoideae are included. An emended generic description of Pachyarthron and an account of P. cretaceum are provided. Brief accounts of four infraspecific taxa never transferred into Pachyarthron...
D. Penrose - One of the best experts on this subject based on the ideXlab platform.
-
hydrolithon farinosum lamouroux comb nov implications for generic concepts in the mastophoroideae Corallinaceae rhodophyta
Phycologia, 1993Co-Authors: D. Penrose, Y.m. ChamberlainAbstract:Abstract Studies of the type of Fosliella (Corallinaceae, Rhodophyta), F. farinosa (Lamouroux) Howe, have shown that it possesses features considered characteristic of Hydrolithon. Tetrasporangial conceptacle pore canals are lined by conspicuous elongate cells arising from filaments interspersed amongst sporangial initials; these cells do not protrude laterally into the canal and are oriented more or less perpendicularly to the roof surface. This new information has led to the conclusion that Fosliella and Hydrolithon are congeneric. Thus, Fosliella Howe 1920 becomes a heterotypic synonym of Hydrolithon Foslie 1909 and Fosliella farinosa (Lamouroux) Howe is transferred to Hydrolithon as H. farinosum (Lamouroux) comb. nov. It has also been shown that the spore germination disc consists of a 4-celled central element surrounded by 12 cells, and it is proposed that thin plants traditionally attributed to Fosliella be referred to as the Fosliella-state of Hydrolithon. Recent changes to generic delimitation wit...
-
A reassessment of type collections of non-geniculate Corallinaceae (Corallinales, Rhodophyta) described by C. Montagne and L. Dufour, and of Melobesia brassica-florida Harvey
Phycologia, 1993Co-Authors: J. Woelkerling, D. Penrose, Y.m. ChamberlainAbstract:Abstract The status and disposition of species of non-geniculate Corallinaceae (Corallinales, Rhodophyta) described by Montagne and by Dufour and of Melobesia brassica-florida Harvey have been determined from studies of the original collections. Lectotypes have been designated for Melobesia grandiuscula Montagne, M. Jrondosa Dufour and M. notarisii Dufour. M. grandiuscula is transferred to Lithophyllum as a distinct species (Lithophyllum grandiusculum (Montagne) comb. nov.). Melobesia Jrondosa is considered a heterotypic synonym of Lithophyllum grandiusculum. Melobesia brassica-florida and LithothamnionJosliei Heydrich (= Neogoniolithon Josliei (Heydrich) Setchell et Mason), the type of Neogoniolithon, are considered conspecific; the epithet brassica-florida has nomenclatural priority. Melobesia notarisii is also considered a heterotypic synonym of N. brassica-florida (Harvey) Setchell et Mason. Morphological and anatomical accounts of these collections are presented, and relevant historical and nomenclat...
-
neogoniolithon fosliei Corallinaceae rhodophyta the type species of neogoniolithon in southern australia
Phycologia, 1992Co-Authors: D. PenroseAbstract:Abstract Studies of numerous southern Australian populations, two populations from tropical Western Australia, and the type material of Neogoniolithon fosliei (Heydrich) Setchell et Mason (Corallinaceae, Rhodophyta), the type species of Neogoniolithon, have revealed new data that necessitate a recharacterization of the genus. The arrangement of cells in the ventral region of the thallus, a feature previously used to distinguish Neogoniolithon from Spongites, varies from coaxial to non-coaxial and can no longer be used. Male conceptacles and carposporophytes of Neogoniolithon fosliei are described for the first time. Male conceptacles produce simple spermatangia on both the floor and roof of the conceptacle chamber, and gonimoblast filamentsarise dorsally during carposporophyte development from apparently discontinuous fusion cells. In terms of spermatangial arrangement and carposporophyte morphology, Neogoniolithon appears to be unique amongst genera of the subfamily Mastophoroideae, and the generic descr...
-
hydrolithon cymodoceae foslie comb nov Corallinaceae rhodophyta in southern australia and its relationships to fosliella
Phycologia, 1992Co-Authors: D. PenroseAbstract:Abstract An examination of southernAustralian populations of Hydrolithon cymodoceae (Foslie) comb. nov. (Basionym: Melobesia cymodoceae Foslie) (Corallinaceae, Rhodophyta) has shown that plants vary considerably in thallus thickness. Tetrasporangial conceptacles have pore canals lined by a ring of conspicuous, elongate cells that arise from filaments interspersed amongst sporangial initials, do not protrude into the canal, and are oriented more or less perpendicularly to the thallus surface. These conceptacle features are considered diagnostic of Hydrolithon, and thus the species has been transferred into this genus. In addition, the species shows a number of distinctive features associated with reproduction. Tetrasporangial conceptacles usually contain a single zonately divided tetrasporangium lying horizontally within the chamber. Irregularly divided tetrasporangia, bisporangia, and undivided sporangia resembling monosporangia are also sometimes formed. Carposporangial conceptacles contain a single carp...
-
a reappraisal of hydrolithon and its relationship to spongites Corallinaceae rhodophyta
Phycologia, 1992Co-Authors: D. Penrose, Wm J WoelkerlingAbstract:Abstract Studies of tetrasporangial conceptacle development and anatomy have led to the conclusion that Spongites and Hydrolithon (of which Porolithon is considered to be a heterotypic synonym) are distinct genera of the Corallinaceae (Rhodophyta). In Australian populations of Hydrolithon reinboldii (Weber van Bosse et Foslie) Foslie, the type species of Hydrolithon, and Porolithon onkodes (Heydrich) Foslie, the type species of Porolithon, the tetrasporangial conceptacle pore canal is lined by a ring of conspicuous, elongate cells that arise from filaments interspersed amongst sporangial initials, do not protrude into the canal, and are oriented more or less perpendicularly to the roof surface. In Spongites fruticulosus Kutzing, the type species of Spongites, the pore canal is lined by cells that arise from peripheral roof filaments, protrude into the canal and are oriented more or less parallel to the roof surface. Tetrasporangial conceptacle development in Hydrolithon reinboldii and Porolithon onkodes i...
Y.m. Chamberlain - One of the best experts on this subject based on the ideXlab platform.
-
three species of mastophora rhodophyta corallinales Corallinaceae in the tropical indo pacific ocean m rosea c agardh setchell m pacifica heydrich foslie and m multistrata sp nov
Phycologia, 2009Co-Authors: D W Keats, Y.m. Chamberlain, Gavin W Maneveldt, Masasuke Baba, Janet LewisAbstract:Abstract Keats D.W., Maneveldt G.W., Baba M., Chamberlain Y.M. and Lewis J.E. 2009. Three species of Mastophora (Rhodophyta: Corallinales, Corallinaceae) in the tropical Indo-Pacific Ocean: M. rosea (C. Agardh) Setchell, M. pacifica (Heydrich) Foslie, and M. multistrata, sp. nov. Phycologia 48: 404–422. DOI: 10.2216/08-101.1. Three species of Mastophora (Corallinaceae, Corallinales, Rhodophyta) were found in extensive studies of non-geniculate coralline algae in various areas of the tropical Indo-Pacific, including French Polynesia, Fiji, Ryukyu Islands (Japan), and Taiwan. Two species are delicate and leafy but are distinguishable on morphological grounds. Mastophora rosea plants are taeniform, dichotomously branched, and weakly calcified and have rolled margins. Their thalli show very little secondary growth, with only occasional small round patches at the surface. Tetrasporangial and carposporangial conceptacles are very high (330–640 μm) and dome-shaped to almost spherical. Mastophora rosea plants col...
-
mesophyllum capense rosanoff comb nov rhodophyta Corallinaceae from south africa
Cryptogamie Algologie, 2000Co-Authors: Y.m. ChamberlainAbstract:Abstract Lithophyllum capense Rosanoff (Rhodophyta, Corallinaceae) was described on the basis of herbarium specimens in Lamouroux's and Lenormand's herbaria in Caen, France. The specimens were epiphytic on Gelidium sp. from The Cape of Good Hope, South Africa. The structure and systematics of the lectotype and paratype specimens are compared with material collected recently in South Africa. The plants have markedly prominent, multiporate tetrasporangial conceptacles and belong to the subfamily Melobesioideae. The presence of monomerous growth, a single layer of non-flared epithallial cells, subepithallial initials that are as long as or longer than subtending cells and simple spermatangial systems on the floor and walls of male conceptacles place this species in the genus Mesophyllum : comparison with other known species of this genus shows that Mesophyllum capense (Rosanoff) comb. nov. is a distinct species with a distribution restricted, as far as is known, to South Africa.
-
lithothamnion superpositum foslie a common crustose red alga Corallinaceae in south africa
Cryptogamie Algologie, 2000Co-Authors: D W Keats, Gavin W Maneveldt, Y.m. ChamberlainAbstract:Abstract A species of non-geniculate coralline alga that is common in the subtidal zone of South Africa (SA) was studied from collections made around the SA coast. It was compared with the holotype of Lithothamnion superpositum , to which it was found to conform. SA material and the type were also compared with published descriptions and illustrations of Lithothamnion indicum from Australia. These taxa are conspecific, so L. indicum is a heterotypic synonym of L. superpositum , which epithet has historical priority. Specimens from Madeira were also found to conform to this species.
-
the occurrence of ezo epiyessoense adey masaki akioka rhodophyta Corallinaceae in england with a summary of parasitism and endophytism in nongeniculate Corallinaceae
Cryptogamie Algologie, 1999Co-Authors: Y.m. ChamberlainAbstract:Abstract The parasitic, nongeniculate, coralline red alga Ezo epiyessoense (Rhodophyta, Corallinaceae) was described in 1974 by Adey, Masaki & Akioka on the basis of specimens growing on Lithophyllum yessoense in Japan. The authors considered Ezo to be an adelphoparasite because it resembled its host taxonomically in being a member of the coralline subfamily Lithophylloideae. The species had not been recorded outside Japan until the present observation in England where it was found growing on another lithophylloid species, Titanoderma pustulatum. The structure of the English material of E. epiyessoense is described and shown to closely resemble that of the type material despite its occurrence on a different host species. Tetrasporangia and trisporangia are recorded for the first time in Ezo. A summary is given of known nongeniculate coralline parasites, semi-endophytes and outgrowths.
-
Observations on Lithophyllum lichenoides Philippi (Rhodophyta, Corallinaceae) and its reproductive structures
Cryptogamie Algologie, 1997Co-Authors: Y.m. ChamberlainAbstract:Lithophyllum lichenoides (Rhodophyta, Corallinaceae) est une alge rouge, coralline, non-articulee, commune, qu'on trouve dans la zone de ressac, un peu au dessus du niveau, le long des cotes de la Mediterranee occidentale et des cotes atlantiques de France et d'Espagne. Son apparence externe et son anatomie vegetative sont bien connues mais on a peu de renseignements quant aux caracteres de sa reproduction. On donne ici une description (basee sur des thalles recoltes recemment au nord de l'Espagne et en France mediterraneenne) de ses structures vegetatives, de celles des spermatocystes, des carpogones/carposporocystes et des tetrasporocystes. Des cellules bloquant les pores sont presentes dans les conceptacles a tetraspores.
Wm J Woelkerling - One of the best experts on this subject based on the ideXlab platform.
-
a monographic account of australian species of amphiroa Corallinaceae rhodophyta
Australian Systematic Botany, 2013Co-Authors: Adele S. Harvey, Wm J Woelkerling, John M. Huisman, Carlos Frederico D GurgelAbstract:The first Australia-wide monograph of Amphiroa (Corallinaceae, Rhodophyta) based on the morphological–anatomical species concept has confirmed the occurrence of nine species (A. anceps, A. beauvoisii, A. crassa, A. exilis, A. foliacea, A. fragilissima, A. gracilis, A. klochkovana, A. tribulus) and provides a basis for future molecular-systematics studies. A comparative analysis of 285 specimens from 121 localities, along with type material examinations, yielded clear evidence that nine characters associated with the vegetative system and tetrasporangial conceptacles were diagnostically significant at species level. Detailed accounts of each species are presented, along with an identification key, data on type specimens, species comparisons and biogeographic notes. A. foliacea is epitypified. Brief accounts of 34 additional taxa reported from Australia and at some stage ascribed to Amphiroa are included. Galaxaura versicolor and Amphiroa galaxauroides are heterotypic synonyms of A. anceps; recognition of A. anastomosans, A. ephedraea and A. nobilis as distinct species requires further evaluation; and A. dilatata and A. gaillonii are species of uncertain status. Amphiroa ephedraea is lectotypified. The remaining 27 names involve nomina nuda, illegitimate names, orthographic variants or taxa now excluded from Amphiroa.
-
the Corallinaceae subfamily mastophoroideae corallinales rhodophyta in south eastern australia
Australian Systematic Botany, 2006Co-Authors: Adele S. Harvey, Wm J Woelkerling, Louise Phillips, Alan J K MillarAbstract:The first monographic account of the south-eastern Australian representatives of the Corallinaceae, subfamily Mastophoroideae (Corallinales, Rhodophyta) is presented. The Mastophoroideae contains eight extant genera, four of which [Hydrolithon, Mastophora, Neogoniolithon, Pneophyllum] were confirmed to occur in south-eastern Australia. Hydrolithon is represented by six species (H. farinosum, H. improcerum, H. munitum, H. onkodes, H. rupestre and H. samoense). Pneophyllum is represented by three species (P. coronatum, P. fragile and P. submersiporum) while Mastophora and Neogoniolithon are represented by a single species each (Mastophora pacifica and Neogoniolithon brassica-florida). Morphological and anatomical accounts are provided, including keys to genera and species, comparisons with related south-eastern Australian mastophoroid species, information on distribution, seasonality, habitat and nomenclature. Brief biogeographical comparisons between south-eastern Australia and other Australasian regions are also made.
-
mesophyllum incisum Corallinaceae rhodophyta in southern australia implications for generic and specific delimitation in the melobesioideae
European Journal of Phycology, 1992Co-Authors: Wm J Woelkerling, Adele S. HarveyAbstract:Detailed morphological, anatomical and systematic studies of southern Australian populations and the designated lectotype of Mesophyllum incisum (Corallinaceae, Rhodophyta) have shown that several growth-forms occur and the filamentous core in dorsiventrally organized parts of the thallus can vary from coaxial to noncoaxial. Spermatangia are simple and develop centripetally on the chamber floor and roof; initials are overlain by “protective” cells during early stages of development. One or possibly several independent fusion cells may develop within female conceptacles after karyogamy. Tetrasporangial conceptacles are initiated from filaments containing elongate subterminal cells, and pore canals of mature conceptacles are lined by distinctive cells that differ in shape from other roof cells. These results have led to a reconsideration of the delimitation of Mesophyllum as a genus and to differences between M. incisum and the type species, M. lichenoides. A description of the species is provided along wit...
-
a reappraisal of hydrolithon and its relationship to spongites Corallinaceae rhodophyta
Phycologia, 1992Co-Authors: D. Penrose, Wm J WoelkerlingAbstract:Abstract Studies of tetrasporangial conceptacle development and anatomy have led to the conclusion that Spongites and Hydrolithon (of which Porolithon is considered to be a heterotypic synonym) are distinct genera of the Corallinaceae (Rhodophyta). In Australian populations of Hydrolithon reinboldii (Weber van Bosse et Foslie) Foslie, the type species of Hydrolithon, and Porolithon onkodes (Heydrich) Foslie, the type species of Porolithon, the tetrasporangial conceptacle pore canal is lined by a ring of conspicuous, elongate cells that arise from filaments interspersed amongst sporangial initials, do not protrude into the canal, and are oriented more or less perpendicularly to the roof surface. In Spongites fruticulosus Kutzing, the type species of Spongites, the pore canal is lined by cells that arise from peripheral roof filaments, protrude into the canal and are oriented more or less parallel to the roof surface. Tetrasporangial conceptacle development in Hydrolithon reinboldii and Porolithon onkodes i...
-
southern australian species of melobesia Corallinaceae rhodophyta
Phycologia, 1991Co-Authors: K M Wilks, Wm J WoelkerlingAbstract:Abstract The genus Melobesia (Corallinaceae, Rhodophyta) is represented in southern Australia by two species: M. membranacea (Esper) Lamouroux, which occurs throughout the world, and M. rosanoffii (Foslie) Lemoine, known only from the study region. Detailed studies of the type specimens of both species are provided, together with taxonomic, morphological and anatomical accounts of southern Australian populations. An assessment of diagnostic and ancillary characters has shown that the mode of tetrasporangial and carposporangial conceptacle development, thickness and anatomy of male conceptacle roofs, and thickness and anatomy of carposporangial conceptacle roofs can be used to delimit the species. None of the diagnostic characters used to separate the two southern Australian species has been used previously for species delimitation within the genus. Twelve additional entities reported from southern Australia under the name Melobesia have been excluded from the genus, and one additional species (M. darwinii...
