- end of the
Devonian period,
several groups,
including the lycopods,
sphenophylls and progymnosperms, had
independently evolved "megaspory" –
their spores...
- the
fertile upper lobe
bearing the sporangia) or
loose strobili. All
sphenophylls are homosporous, with
monolete or
trilete spores.
Sphenophyllales was...
- Jiří; Drábková, Jana (December 2008). "Two New
Carboniferous Fertile Sphenophylls and
their Spores from the
Czech Republic". Acta
Palaeontologica Polonica...
- pond. The
upper bed has the
greatest portion of sphenophytes, not just
sphenophylls (Sphenophyllum cf. thonii) but also
calamitaleans (Annularia carinata...
- ; Pšenička, J.; Votočková Frojdová, J. (2021). "New data
about three sphenophylls and
their spores from the
volcanic tuff of Wuda,
Taiyuan Formation, earliest...
