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progymnosperm

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Noun1.progymnosperm - an ancestral fossil type from which modern gymnosperms are thought to have derived
gymnosperm - plants of the class Gymnospermae having seeds not enclosed in an ovary
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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).
The Pennsylvanian Joggins Formation of Nova Scotia: sedimentological ... by Davies, S.J.; Gibling, M.R.; Rygel, M.C.; Calder, J.H.; Skilliter, D.M. / Atlantic Geology
Their results arrange the Devonian species such that a clade consisting of the progymnosperm Tetraxylopteris plus the trimerophyte Pertica is the sister group to a clade that includes fernlike plants and the putative equisetophyte Hyenia (Kenrick & Crane, 1997: [ILLUSTRATION FOR FIGURE 4:31 OMITTED]).
FOSSILS AND FERN PHYLOGENY by The Botanical Review
What is more, progymnosperms were discovered and defined and have become a leading candidate as coniferophyte ancestors.
Implications of Fossil Conifers for the Phylogenetic Relationships of ... by Miller Jr., Charles N. / The Botanical Review
 
 
 
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