SINCE 1828
Alethopteris
noun
Al·e·thop·ter·is
| \ ˌa-lə-ˈthäp-tə-rəs\
Definition of Alethopteris
: a genus of large fossil seed ferns represented by abundant remains in Carboniferous coal measures and having large bipinnate to tripinnate fronds with the thick pinnules being inserted on the rachis by a broad decurrent base
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