Psilotum Sw.
Sporangia 3-lobed, 3-celled (rarely 2-4-celled), subglobose, terminal on very short lobes or almost sessile, the scale-like branches embracing the sporangium. Plant us. terrestrial and erect, axis many times dichotomously branched, sterile lobes scale-like, minute, along the angles of the axis. A very few spp., mainly tropical and subtropical. The N.Z. sp. with the range of the genus.
