Elkinsia gen. nov., a Late Devonian Gymnosperm with Cupulate Ovules

@article{Rothwell1989ElkinsiaGN,
  title={Elkinsia gen. nov., a Late Devonian Gymnosperm with Cupulate Ovules},
  author={Gar W Rothwell and Stephen E. Scheckler and William Honyman Gillespie},
  journal={Botanical Gazette},
  year={1989},
  volume={150},
  pages={170 - 189}
}
An extensive collection of fossilized ovules, ovulate cupules, and cupuliferous branching systems from late Devonian deposits of eastern West Virginia is described and named Elkinsia polymorpha gen. et sp. nov. Elkinsia cupules are borne at the tips of cruciately forking axes that show a moderate level of overtopping. Cupules are 1.0-1.8 cm long and 0.6-1.2 cm in maximum diameter. The cupule is constructed of slender axes that fork twice to produce four quarters; each quarter terminates in one… Expand
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Latisemenia is the earliest known plant with ovules borne on the side of the fertile axis and may foreshadow the diverse ovule arrangements found among younger seed plant lineages that emerge in the Carboniferous. Expand
Early seed plants in the Southern Hemisphere: I. Associated ovulate and microsporangiate organs from the carboniferous of Peru
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TLDR
Elkinsia polymorpha is the first seed f Fern to be reconstructed from Devonian sediments and the first preovulate seed fern to be characterized as a plant, and represents an important evolutionary unit for ongoing phylogenetic studies of the origin of seed plants. Expand
Thorezia vezerensisgen. et sp. nov., a new seed plant with multiovulate cupules from the Late Devonian of Belgium
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It is suggested here that the arid climatic conditions prevailing in eastern Laurussia favoured the development of diverse spermatophyte communities and contributed to reduced diversity and abundance of contemporaneous free-sporing plant diversity. Expand
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TLDR
The uniovulate cupule in Pseudosporogonites is distinct from multiovulate telomic cupules of other Devonian seeds and expands the phenotypic diversity seen during the earliest phase of seed plant radiation, which was geologically instantaneous. Expand
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TLDR
The considerably fused cupule of Calycosperma suggests an earlier differentiation of multi-ovulate cupules in Famennian, which is inferred to provide greater protection to ovules and possibly imply a hydrochoric reproduction strategy for this plant. Expand
Dorinnotheca streelii Fairon-Demaret, gen. et sp. nov., a new early seed plant from the upper Famennian of Belgium
TLDR
This new early seed plant bears cupules hanging singly at the tips of the slender ultimate axes of a pinnately branched system, which is described from three upper Famennian localities in Belgium. Expand
Cosmosperma polyloba gen. et sp. nov., a seed plant from the Upper Devonian of South China
TLDR
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Faironia difasciculata, a new gymnosperm from the Early Carboniferous (Mississippian) of Montagne Noire, France
TLDR
Faironia is the sixth genus of seed plant affinities based on stems reported from the Montagne Noire deposits that, to date, comprise the most diverse assemblage of permineralised seed plant remains from just above the Devonian/Carboniferous boundary. Expand
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TLDR
They show that nearly total ovule enclosure, a level of organization approaching angiospermy, was achieved by advanced seed ferns during the Mesozoic, and include tetrahedral seeds within cupule- or carpel-like structures. Expand
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References

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TLDR
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