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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.
Rhizome subterranean, clothed with brown, rhizoidal hairs. Aerial shoots erect or pendulous, branched dichotomously many times in the upper part. Sterile leaves small, scale-like, lacking a vascular nerve; sporogenous leaves bifid, otherwise similar to sterile ones. Synangia large, trilobed, obtuse, yellow. See also Du Puy (1993), Green (1994).
Plants terrestrial, sometimes epiphytic. Aerial shoots often clumped, simple proximally, dichotomously branched distally, 3(--several)-ridged. Appendages minute, bractlike, borne distally on ridges of aerial shoots, sterile appendages subulate, those subtending synangia 2-lobed. Synangia ± globose, obscurely 3-lobed.
