progymnosperm


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Words related to progymnosperm

an ancestral fossil type from which modern gymnosperms are thought to have derived

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References in periodicals archive ?
Psilotum and Tmesipteris), one extinct heterosporous progymnosperm, three extinct and one extant seed plants, and the extinct homosporous trimerophyte Psilophyton crenulatum (Appendix 1).
Drifted lycopsid plants predominate in the basal limestones, whereas overlying siltstones and sandstones contain a mixed suite of drifted gymnosperms (cordaitaleans), sphenopsids (primarily calamiteans), pteridosperms and putative progymnosperms (Falcon-Lang 2003a).
Over fifteen years of study in this shale have revealed the presence of many lycopsid axes and cones, and some progymnosperms.
The bisaccate pollen of many conifers occurs as well in both Paleozoic and Mesozoic seed ferns, and the pycnoxylic wood typical of the group is also found in ginkgos and many fossil groups beginning with the progymnosperms.
The Ophioglossales have been regarded as "living progymnosperms," related to the seed plants rather than to other ferns (Takahashi & Kato, 1988).