Cryptogramma (Rockbrake) is a genus of herb in the family Pteridaceae. They are native to The Contiguous United States, Alaska, and Canada. They have bipinnate leaves. They have alternation of generations.
Definition: The important feature of homospory is the four fold division involved in spore production, this takes the form of either a tetrahedra which gives a trilete (Y shaped scar) spore or a tetragon which gives a monolete (single linear scar) spore.