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
Latisemenia longshania, gen. et sp. nov., a new Late Devonian seed plant from China
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Characterizing the Most Primitive Seed Ferns. I. A Reconstruction of Elkinsia polymorpha
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New specimens of cupules assignable to Hydrasperma longii Matten et al. have been collected at Oxroad Bay in southern Scotland, showing that H. tenuis ovules are produced by at least two different kinds of plants and reveals that ovule structure alone is not always a reliable taxonomic indicator among primitive gymnosperms. Expand
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Comparison of H. tenuis with other cupulate Lower Carboniferous seeds indicates that two major branching patterns of the cupule occur in early seed plants, and the Aneurophytales appears to have the branching patterns consistent with its position as the ancestral group. Expand
A probable pteridosperm from the uppermost Devonian near Ballyheigue, Co. Kerry, Ireland
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The divisions of the sympodial protoxylem strand forming the rachial trace is compared among the Aneurophytales, Buteoxylonaceae, Calamopityaceae and Lyginopteridaceae and is shown to be similar. Expand
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TLDR
Two parts of a single, anatomically preserved stem fragment form the basis of a new Lower Mississippian taxon that is characterized here in detail and hypothesize that the protoxylem strands may comprise five sympodia and that although protostelic in gross morphology, the primary vascular system of Galtiera might actually be more similar to typical eusteles of the Calamopityaceae than protostelles of any other major group. Expand
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TLDR
It is recognized that the early seed plants were at least initially anemophilous and that pollination may have been determined in large part by the morphology of the ovule. Expand
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TLDR
These seeds predate Archaeosperma arnoldii1 from the Fa2d of northeastern Pennsylvania, the oldest previously reported seed, and are more primitively organized than all except Genomos perma2,3. Expand
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The flora from this stratigraphic and geographic area is comparable to the Cementstone flora of Scotland and the Montagne Noire flora of France (both Tournaisian). Expand
XII.—On Salpingostoma dasu : A New Carboniferous Seed from East Lothian
In a recent paper (Gordon, 1938) reasons were given for the belief that semi-arid conditions prevailed during Lower Carboniferous times in the neighbourhood of North Berwick, East Lothian. TheExpand
Additions to the silicified upper devonian/lower carboniferous flora from ballyheigue, Ireland
Abstract Continuing study of the uppermost Devonian flora from Ballyheigue, County Kerry, Ireland (Tn1a-Tn1b) has resulted in the addition of four taxa. Two plants, Tristichia sp. and cf.Expand
Distribution of anatomically-preserved floras in the Lower Carboniferous in Western Europe
Twelve localities of Lower Carboniferous strata in Scotland (Loch Humphrey Burn, Glenarbuck, Pettycur, Oxroad Bay and the Berwickshire localities of Cove, Burnmouth, Gavinton, Edrom, Foulden) and inExpand
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