ALL meanings of prothallium
pro·thal·li·um
P p - noun plural prothallium Botany. the gametophyte of ferns and related plants. 1
- noun plural prothallium the analogous rudimentary gametophyte of seed-bearing plants. 1
- noun prothallium a minute, flat, greenish disc of cells bearing sex organs on its lower side, usually attached to the ground by single-celled hairs, and forming the haploid, sexual generation of ferns and similar plants 0