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Corystosperms are a
group of
extinct seed
plants (often
referred to as "seed ferns")
belonging to the
family Corysto****ceae (also
called Umkomasiaceae)...
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Komlopteris is an
extinct genus of "seed fern" with
possible corystosperm affinities.
Fossils have been
found across both hemispheres,
dating from the...
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orders Ginkgoales †Czekanowskiales †Pelta****les? †Umkomasiales? (
corystosperms) †Caytoniales? †Dicranophyllales? †Calamopityales? †Callistophytales...
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Lepidopteris persisting into the
Early Jur****ic in Patagonia. Dicroidium, a
corystosperm seed fern that was a
dominant part of
Gondwanan floral communities during...
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umkomasialean (or
corystosperm) D. cr****um
Ischigualasto Provincial Park (San Juan Province)
Frond fragments An
umkomasialean (or
corystosperm) D.
dubium Ischigualasto...
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suggestions including at
least some of the
following groups: glossopterids,
corystosperms,
Petriellales Pentoxylales,
Bennettitales and Caytoniales), but not...
- †Glossopteridales †Lyginopteridales †Medullosales †Pelta****les †Umkomasiales (
corystosperms) †Czekanowskiales †Bennettitales †Erdtmanithecales †Pentoxylales †Petriellales...
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genus of fork-leaved seed plants. It is the
archetypal genus of the
corystosperms, an
extinct group of seed plants,
often called "seed ferns", ****igned...
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Umkomasia is a
genus of seed
bearing organs produced by
corystosperm seed ferns,
first based on
fossils collected by
Hamshaw Thomas from the
Burnera Waterfall...
- fossils;
these were
found alongside their bodies.
Dicroidium an
extinct corystosperm tree that was
widespread and
dominant over
Gondwana during the Tri****ic...
