-
Crossotheca is an
extinct genus of seed
ferns (Pterido****tophyta)
widespread in coal
measures of Carboniferous,
Permian and Tri****ic age, with possible...
- Cretaceous. One species, S. höninghausi, was
transferred to the
genus Crossotheca in 1911. The
frond of
Sphenopteris could be up to 20
inches (51 cm) long...
- Rhabdocarpus,
Trigonocarpus Fern fronds: Aphlebia, Bertrandia, Corynepteris,
Crossotheca, Cyathocarpus, Lobatopheris, Oligocarpia, Pecopteris, Polymorphopteris...
-
probably homologous to a
pinnule on the
vegetative fronds. For instance,
Crossotheca synangia bore elongate, "epaulet"-shaped pads, that were
arranged in...
- The pollen-bearing
organs of the
early flower Crossotheca...
-
Crossotheca hughesiana Kidston,
Middle Pennsylvanian, Coseley, near Dudley, UK. A
lyginopteridalean pollen organ preserved as an
authigenic mineralization...
- The
pollen bearing organs of the
early "flower"
Crossotheca...
- annulus, magnified. E - Oligocarpia.
Sorus in surface-view, magnified. F -
Crossotheca.
Fertile pinnule,
bearing several tufts of microsporangia, magnified...
-
tentative report †Cristatisporites †Cristatisporites
alpernii †
Crossotheca †
Crossotheca sagittata †Crotalocrinites †Crotalocrinus †Crotalocrinus cora †Crurithyris...
- †Cristatisporites †Cristatisporites
alpernii †Cristatisporites
indignabundus †
Crossotheca †Crotalocrinites †Crotalocrinites cora †Crotalocrinites
vanhornei †Crurithyris...
