Plants reproducing by spores such as mosses and ferns are grouped under the general term

Step-by-step solution

Eichler divided the plant kingdom into two subkingdoms: Cryptogamae-plants without flowers and seeds Phanerogamae-plants that bear flowers and seeds. Cryptogams are further classified into three divisions: thallophyta, bryophyta, and pteridophyta. These are spore-bearing plants and commonly called as hidden plants which reproduce by producing spores.