Hypanthium

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Jiří Kvaček - One of the best experts on this subject based on the ideXlab platform.

  • Reinterpretation of fossil reproductive structures Zlivifructus microtriasseris (Normapolles complex, Fagales) from the Czech and Polish Late Cretaceous
    Review of Palaeobotany and Palynology, 2019
    Co-Authors: Zuzana Heřmanová, Jiří Kvaček, Adam T. Halamski, Petra Zahajská, Jan Šilar
    Abstract:

    Flowers and fruits of Zlivifructus microtriasseris, originally described as Caryanthus microtriasseris from the late Turonian to Santonian of the South Bohemian Basins and the late Coniacian to early Santonian of the North Sudetic Basin, are reinterpreted here. Zlivifructus microtriasseris is represented by small, flat fruits, round in outline with persistent perianths, which are fused basally, forming the Hypanthium. The Hypanthium extends for more than two-thirds of the fruit. Tepals leave scars indicating their insertion. Lateral attachment scars of tepals and medial attachment scars are immediately adjacent to each other, with indistinct boundaries forming a ring. The androecium consists of four stamens. The fruit shows the unilocular nature of the nut with a single seed. Lateral faces of the fruit show two parallel ribs or ridges, running from the base of the fruit to the margin of the Hypanthium. The surface of the fruit bears irregularly shaped cells. Zlivifructus microtriasseris differs from species assigned to genus Caryanthus Friis 1983 in the presence of four stamen scars, and in having two lateral ribs in the face of the fruit. Zlivifructus microtriasseris differs from the type species Zlivifructus vachae in size of the fruit; shape of the fruit; perianth and attachment scars of tepals. A probabilistic classification method to differentiate between the two fruit species based on their size is proposed. (Less)

  • Zlivifructus gen. nov., a new member of the Normapolles complex
    Review of Palaeobotany and Palynology, 2017
    Co-Authors: Zuzana Heřmanová, Jiřina Dašková, Boris Ekrt, Jiří Kvaček
    Abstract:

    Abstract New Normapolles reproductive structures are described from several Late Cretaceous stratigraphic horizons of central and western Europe: the Klikov Formation (late Turonian–Santonian), the Aachen Formation (Santonian) and the Walbeck Formation (Maastrichtian). They are assigned to a new genus, Zlivifructus , containing three new species, Zlivifructus vachae , Zlivifructus sklenarii and Zlivifructus sp. The new genus is based on several small flowers/fruits. The flowers are bisexual, bisymmetrical and have an inferior ovary with a Hypanthium. The tepals are attached on top of the Hypanthium. The genus has four tepals, in two decussate pairs. The androecium consists of four stamens. The gynoecium is bicarpellate, with a unilocular ovary and two styles. Fruits are nuts with a single erect, orthotropous seed. Zlivifructus is separated from Caryanthus based on the presence of four stamens. Both bear pollen grains of the Normapolles group. Organization of the flowers/fruits in Zlivifructus , as well as the structure of the pollen indicate that this new Normapolles flower is of core fagalean affinity. The new genus is closely related to other Normapolles genera, particularly Caryanthus , and may be close to the base of the Juglandaceae-Rhoipteleaceae clade.

Zuzana Heřmanová - One of the best experts on this subject based on the ideXlab platform.

  • Reinterpretation of fossil reproductive structures Zlivifructus microtriasseris (Normapolles complex, Fagales) from the Czech and Polish Late Cretaceous
    Review of Palaeobotany and Palynology, 2019
    Co-Authors: Zuzana Heřmanová, Jiří Kvaček, Adam T. Halamski, Petra Zahajská, Jan Šilar
    Abstract:

    Flowers and fruits of Zlivifructus microtriasseris, originally described as Caryanthus microtriasseris from the late Turonian to Santonian of the South Bohemian Basins and the late Coniacian to early Santonian of the North Sudetic Basin, are reinterpreted here. Zlivifructus microtriasseris is represented by small, flat fruits, round in outline with persistent perianths, which are fused basally, forming the Hypanthium. The Hypanthium extends for more than two-thirds of the fruit. Tepals leave scars indicating their insertion. Lateral attachment scars of tepals and medial attachment scars are immediately adjacent to each other, with indistinct boundaries forming a ring. The androecium consists of four stamens. The fruit shows the unilocular nature of the nut with a single seed. Lateral faces of the fruit show two parallel ribs or ridges, running from the base of the fruit to the margin of the Hypanthium. The surface of the fruit bears irregularly shaped cells. Zlivifructus microtriasseris differs from species assigned to genus Caryanthus Friis 1983 in the presence of four stamen scars, and in having two lateral ribs in the face of the fruit. Zlivifructus microtriasseris differs from the type species Zlivifructus vachae in size of the fruit; shape of the fruit; perianth and attachment scars of tepals. A probabilistic classification method to differentiate between the two fruit species based on their size is proposed. (Less)

  • Zlivifructus gen. nov., a new member of the Normapolles complex
    Review of Palaeobotany and Palynology, 2017
    Co-Authors: Zuzana Heřmanová, Jiřina Dašková, Boris Ekrt, Jiří Kvaček
    Abstract:

    Abstract New Normapolles reproductive structures are described from several Late Cretaceous stratigraphic horizons of central and western Europe: the Klikov Formation (late Turonian–Santonian), the Aachen Formation (Santonian) and the Walbeck Formation (Maastrichtian). They are assigned to a new genus, Zlivifructus , containing three new species, Zlivifructus vachae , Zlivifructus sklenarii and Zlivifructus sp. The new genus is based on several small flowers/fruits. The flowers are bisexual, bisymmetrical and have an inferior ovary with a Hypanthium. The tepals are attached on top of the Hypanthium. The genus has four tepals, in two decussate pairs. The androecium consists of four stamens. The gynoecium is bicarpellate, with a unilocular ovary and two styles. Fruits are nuts with a single erect, orthotropous seed. Zlivifructus is separated from Caryanthus based on the presence of four stamens. Both bear pollen grains of the Normapolles group. Organization of the flowers/fruits in Zlivifructus , as well as the structure of the pollen indicate that this new Normapolles flower is of core fagalean affinity. The new genus is closely related to other Normapolles genera, particularly Caryanthus , and may be close to the base of the Juglandaceae-Rhoipteleaceae clade.

Maya C Nair - One of the best experts on this subject based on the ideXlab platform.

Jan Šilar - One of the best experts on this subject based on the ideXlab platform.

  • Reinterpretation of fossil reproductive structures Zlivifructus microtriasseris (Normapolles complex, Fagales) from the Czech and Polish Late Cretaceous
    Review of Palaeobotany and Palynology, 2019
    Co-Authors: Zuzana Heřmanová, Jiří Kvaček, Adam T. Halamski, Petra Zahajská, Jan Šilar
    Abstract:

    Flowers and fruits of Zlivifructus microtriasseris, originally described as Caryanthus microtriasseris from the late Turonian to Santonian of the South Bohemian Basins and the late Coniacian to early Santonian of the North Sudetic Basin, are reinterpreted here. Zlivifructus microtriasseris is represented by small, flat fruits, round in outline with persistent perianths, which are fused basally, forming the Hypanthium. The Hypanthium extends for more than two-thirds of the fruit. Tepals leave scars indicating their insertion. Lateral attachment scars of tepals and medial attachment scars are immediately adjacent to each other, with indistinct boundaries forming a ring. The androecium consists of four stamens. The fruit shows the unilocular nature of the nut with a single seed. Lateral faces of the fruit show two parallel ribs or ridges, running from the base of the fruit to the margin of the Hypanthium. The surface of the fruit bears irregularly shaped cells. Zlivifructus microtriasseris differs from species assigned to genus Caryanthus Friis 1983 in the presence of four stamen scars, and in having two lateral ribs in the face of the fruit. Zlivifructus microtriasseris differs from the type species Zlivifructus vachae in size of the fruit; shape of the fruit; perianth and attachment scars of tepals. A probabilistic classification method to differentiate between the two fruit species based on their size is proposed. (Less)

Soumya Murugan - One of the best experts on this subject based on the ideXlab platform.