Fossil foliage (part) of the fern Crenulopteris acadica sp. from the Pennsylvanian of Kanakee County, Illinois (PRI 42681). Pinna (portion of a compound leaf). Marattioid fern (Order Marattiales, Family Psaroniaceae). Specimen is on display at the Museum of the Earth, Ithaca, New York. Length of specimen is approximately 16.5 cm. Model by Emily Hauf.
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