- The
progymnosperms are an
extinct group of woody, spore-bearing
plants that is
presumed to have
evolved from the trimerophytes, and
eventually gave rise...
-
Archaeopteris is an
extinct genus of
progymnosperm tree with fern-like leaves. A
useful index fossil, this tree is
found in
strata dating from the Upper...
- †
Progymnosperms (paraphyletic) ****tophytes...
-
Devonian period,
several groups,
including the lycopods,
sphenophylls and
progymnosperms, had
independently evolved "megaspory" –
their spores were of two distinct...
- †
Progymnosperms* †Noeggerathiopsida †Aneurophytopsida †Archaeopteridopsida †Protopityales...
- †
Progymnosperms* †Noeggerathiopsida †Aneurophytopsida †Archaeopteridopsida †Protopityales...
- †
Progymnosperms* †Noeggerathiopsida †Aneurophytopsida †Archaeopteridopsida †Protopityales...
- lycopods, ferns, seed
plants (seed ferns, from
earlier progymnosperms),
first trees (the
progymnosperm Archaeopteris), and
first winged insects (palaeoptera...
- for
various early trees looked like. The
paleosols ****ociated with
progymnosperm trunks are
interpreted to not have
grown in
soils similar to the type...
-
forests of
primitive plants existed: lycophytes, horsetails, ferns, and
progymnosperms evolved. Most of
these plants had true
roots and leaves, and many were...
