psilophyton


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Noun1.psilophyton - any plant or fossil of the genus Psilophyton
tracheophyte, vascular plant - green plant having a vascular system: ferns, gymnosperms, angiosperms
genus Psilophyton - type genus of the Psilophytaceae: genus of small wiry herbaceous Paleozoic plants with underground rhizomes and apical sporangia
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Fewer plants, including Psilophyton crenulatum (Doran 1980) and Spongiophyton (Gensel et al.
Ichnology of the Devonian (Emsian) Campbellton Formation, New Brunswick, Canada
The cauloids bore terminal sporangia, possibly bivalved and similar to those of Psilophyton. The appendages, or phylloids, were considered to be enations, comparable to the leaves of Lycopodium.
The telome theory
The 28 rare species of plant that occur in the Tassili N-'Ajjer Biosphere Reserve include endemic species such as Potamogeton hoggariensis (Potamogetonaceae), Silene hoggariensis (Caryophyl-laceae), Lupinus tassilicus (Leguminosae), and Senecio hoggariensis (Asteraceae), and others such as Ficus ingens (Moraceae), Bergia suffruticosa (Elati-naceae), Hypericum psilophyton (Guttiferae), and Phagnalon garamantum (Asteraceae).
4 Protected areas and biosphere reserves of the hot deserts and subdeserts
It includes some of the same taxa analyzed by Kenrick and Crane (i.e., Aglaophyton and Psilophyton), plus representatives from all of the monophyletic groups that are considered geologically more recent sister groups or descendants of the other taxa analyzed by these authors (Kenrick & Crane, 1997; [ILLUSTRATION FOR FIGURE 1 OMITTED]; Appendix 1).
FOSSILS AND FERN PHYLOGENY

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