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Lignophyte phylogeny and the evolution of spermatophytes : a numerical cladistic analysis
Hanskerpia gen. nov. and phylogenetic relationships among the most ancient conifers (Voltziales)
Numerical cladistic analysis reveals that this novel combination of characters defines a new fossil plant genus and species of walchian conifers Hanskerpia hamiltonensis, and supports some previously proposed relationships among the most primitive conifer and other Paleozoic coniferophytes.
Characterizing the Most Primitive Seed Ferns. I. A Reconstruction of Elkinsia polymorpha
- Rudolph Serbet, G. Rothwell
- Biology, Environmental ScienceINTERNATIONAL JOURNAL PLANT SCIENCES
- 1 December 1992
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.
Elkinsia gen. nov., a Late Devonian Gymnosperm with Cupulate Ovules
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.…
The fossil monocot Limnobiophyllum scutatum: resolving the phylogeny of Lemnaceae.
Results of the analysis indicate that the Lemnaceae plus Pistia form a monophyletic group within the Araceae, and relationships among taxa of the Lemmaceae, Pistia, and selected genera of Araceae are resolved.
Fossils and ferns in the resolution of land plant phylogeny
- G. Rothwell
- Environmental Science, BiologyThe Botanical review
- 1 July 1999
These analyses are a first attempt, which includes extinct plants, to develop cladistic hypotheses for the overall topology of fern phylogeny and to lay the groundwork for more detailed analyses of relationships among the homosporous leptosporangiates.
The role of Hydropteris pinnata gen. et sp. nov. in reconstructing the cladistics of heterosporous ferns
Large segments of intact plants that represent a heterosporous fern have been discovered within an aquatic plant community from the Late Cretaceous St. Mary River Formation near Cardston in southern…
The callistophytales (Pteridospermopsida): Reproductively sophisticated paleozoic gymnosperms
- G. Rothwell
- Environmental Science, Geography
- 1 February 1981
How Does the Inclusion of Fossil Data Change Our Conclusions about the Phylogenetic History of Euphyllophytes?
Tests reveal that relationships among major groups of vascular plants are far less completely understood than claimed by some and that ferns s.l. are probably a polyphyletic assemblage and suggest that the impressive successes of gene sequence data in resolving relationships within smaller clades may not be easily duplicated when addressing deep internal nodes of the polysporangiophyte tree.