Pecoteris sp. is the foliage of a tree fern. Pecopteris grew on Psaronius which was one of the most common fossil tree ferns.
Psaronius reached height of about ten meters (32 feet) and resembled a modern palm tree.
Although common througout much of the late Paleozoic, this plant was most abundant in the Late Pennsylvanian and Permian. Their increasing abundance reflects changing climates at the close of the Paleozoic and may be related to an increase in drier habitats.