Cryptogramma

noun

Cryp·to·gram·ma

ˌkriptəˈgramə

: a genus of ferns (family Polypodiaceae) of arctic and north temperate regions having indusia formed by the revolute margins of fertile fronds that are much taller and have narrower divisions than the sterile ones see rock brake

Word History

Etymology

New Latin, from crypt- + Greek gramma letter, line of a drawing, from graphein to scratch, write, draw; probably from the lines of sporangia, sometimes hidden by the reflexed margin of the frond