Alethopteris
Sign in to saveAlethopteris is a prehistoric plant genus of fossil pteridospermatophytes (seed ferns) that developed in the Pennsylvanian (around ). thumb|left|Alethopteris florentina De Stefani, 1901, Natural History Museum University of Pisa thumb|Alethopteris, at the State Museum of Pennsylvania in Harrisburg.|left thumb|Alethopteris sp.
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Alethopteris is a prehistoric plant genus of fossil pteridospermatophytes (seed ferns) that developed in the Pennsylvanian (around ). thumb|left|Alethopteris florentina De Stefani, 1901, Natural History Museum University of Pisa thumb|Alethopteris, at the State Museum of Pennsylvania in Harrisburg.|left thumb|Alethopteris sp.
thumb|Alethopteris Serlii on mudstone|laminated mudstone from [[St. Clair, Pennsylvania.]]