Journal: Grana

Abbreviation

Grana (Print)

Publisher

Taylor & Francis

Journal Volumes

ISSN

0017-3134
1651-2049

Description

Filters

2013 - 20144
Reset filters

Search Results

Publications 1 - 4 of 4
  • Aperture evolution in Nymphaeaceae
    Item type: Journal Article
    Coiro, Mario; Barone Lumaga, Maria Rosaria (2013)
    Grana
  • Arcellites punctatus sp. nov.
    Item type: Journal Article
    Friis, Else M.; Pedersen, Kaj R.; Marone, Federica (2014)
    Grana
  • Fossil Kajanthus lusitanicus gen. et sp. nov. from Portugal
    Item type: Journal Article
    Mendes, Mário Miguel; Grimm, Guido W.; Pais, João; et al. (2014)
    Grana
  • Welwitschioid diversity in the Early Cretaceous
    Item type: Journal Article
    Friis, Else Marie; Pedersen, Kaj Raunsgaard; Crane, Peter R. (2014)
    Grana
    Bicatia gen. et sp. nov. from the Early Cretaceous of the Northern Hemisphere is described based on three species of dispersed seeds: Bicatia costata from the Juncal and Famalicão localities (western Portugal) and the Kenilworth locality (eastern North America), B. juncalensis from the Juncal locality, and B. rugosa from the Puddledock locality (eastern North America). Seeds of B. costata and B. rugosa are known from both lignitised (Juncal, Kenilworth, Puddledock) and charcoalified specimens (Famalicão, Puddledock), whereas seeds of B. juncalensis are known only from lignitised material (Juncal). All three species have the same characteristic chlamydospermous organisation seen in the wide range of other Early Cretaceous seeds that have been assigned to the Bennettitales-Erdtmanithecales-Gnetales (BEG) group. However, the species of Bicatia differ from all previously described BEG seeds in having a disymmetrical and flattened seed envelope with more or less distinct lateral wings. All three species are also closely associated with polyplicate pollen grains that have a prominent distal colpus. Pollen grains of this kind are very similar to those of extant Welwitschia. The combination of seed and pollen features seen in Bicatia provides the strongest documentation so far of Welwitschia-like plants in the Northern Hemisphere during the Early Cretaceous.
Publications 1 - 4 of 4