The Order Psilotales is characterized by a rootless, dichotomously branched sporophyte, which is partly underground and partly subaerial. The latter part may be leafless or leafy. The sporangia are in diads (e.g., Tmesipteris) or triads (e.g. Psilotum). The gametophytes are entirely subterranean. The Order includes two genera: Psilotum and Tmesipteris. Before the recognition of the […]
Affinities of Psilotales (With Diagram) | Pteridophyta | Botany
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