Psilopsida
plural noun
Psi·lop·si·da
| \ sīˈläpsədə\
Definition of Psilopsida
: a subdivision of Tracheophyta comprising vascular plants with no roots, leaves only partially differentiated or lacking, no leaf traces, a usually protostelic vascular cylinder, and the sporangia merely terminal enlargements of the stem — compare lycopsida , pteropsida , sphenopsida
Keep scrolling for more