Alethopteris

{{Short description|Extinct genus of plants}}

{{Automatic taxobox

| fossil_range = {{Geological range/linked|Pennsylvanian|Aptian|link1=Pennsylvanian (geology)}}

| image = Alethopteris grandini (fossil seed fern).jpg

| image_caption = Alethopteris grandini, late Carboniferous, Kansas. At the Royal Tyrrell Museum of Palaeontology.

| taxon = Alethopteris

| authority =

}}

Alethopteris is a prehistoric plant genus of fossil pteridospermatophytes (seed ferns) that developed in the Carboniferous period (around {{period span/brief|Carboniferous|-1}}).{{Cite web|url=http://www.fossilmuseum.net/plantfossils/Alethopteris-valida/Alethopteris.htm|title=Seed Fern Fossil|website=www.fossilmuseum.net|access-date=2016-12-01}}

File:Alethopteris PAMuseum.jpg in Harrisburg.|left]]

File:Alethopteris sp.jpg

File:Alethopteris Serlii, PMG.jpg from St. Clair, Pennsylvania.]]