Cryptogamia

noun

1. in former classification systems: one of two major plant divisions, including all plants that do not bear seeds: ferns, mosses, algae, fungi

   noun.plant

   Antonyms phanerogamae

   Source: WordNet 3.0

2. The series or division of flowerless plants, or those never having true stamens and pistils, but propagated by spores of various kinds.

   noun

   Source: webster1913