Medical term:

cryptogam

(in obsolete classification schemes) any plant that does not produce seeds, i.e. plants placed in the groups Thallophyta, Bryophyta and Pteridophyta. Whereas in conifers and flowering plants (Phanerogamia) the organs of reproduction are prominent, they are not so in the Cryptogamia - hence the name (‘secret marriage’).

Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

cryp·to·gam·i·a

(krip'tō-gam'ē-ă),

A nontaxonomic division of the plant kingdom containing all forms of plant life that do not reproduce by means of seeds; included are the algae, bacteria, fungi, lichens, mosses, liverworts, ferns, horsetails, and club mosses.

[crypto- + G. gamos, marriage]

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