Source : Webster's Revised Unabridged Dictionary (1913)

Cryptogam \Cryp"to*gam\ (kr?p"t?-g?m), n. [Cf. F. cryptogame.
   See {Cryptogamia}.] (Bot.)
   A plant belonging to the Cryptogamia. --Henslow.

Source : WordNet®

cryptogam
     n : formerly recognized taxonomic group including all flowerless
         and seedless plants that reproduce by means of spores:
         ferns, mosses, algae, fungi