Psaronius
Encyclopedia
Psaronius was a Marattialean tree fern which grew to 10-15m in height, and is associated with leaves of the organ genus
Form taxon
Form classification is the classification of organisms based on their morphology, which does not necessarily reflect their biological relationships...

 Pecopteris
Pecopteris
Pecopteris was a form genus of leaves from several unrelated plant groups that flourished the early Carboniferous period and on to c. 250 Ma. Pecopteris first appeared in the Devonian period, but flourished in the Carboniferous, especially the Pennsylvanian...

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