|Name: Alethopteris sp.
Locality: Mazon Creek, USA
Showcase: Historical geology; Carboniferous
Size: H=ca. 5 m
Seed fern with large leaves. These 5 m tall trees lived in the drier parts of Carboniferous and Early Permian swamps.
The genus "Alethopteris" is a collective navme for plants with similar leaf morphology.