The Collaborative International Dictionary
Cryptogamian
Cryptogamian \Cryp`to*ga"mi*an\ (kr?p`t?-g?"m?-an), Cryptogamic \Cryp`to*gam"ic\ (kr?p`t?-g?m"?k), Cryptogamous \Cryp*to"gam*ous\a. Of or pertaining to the series Cryptogamia, or to plants of that series.
Wiktionary
cryptogamian
a. Of or relating to the cryptogams.