Plants terrestrial; branches tufted, erect, without main indeterminate stem; roots all in one basal tuft. Vegetative buds/bulbils produced in axils of fertile leaves. Fertile leaves neither differentiated nor ranked, persisting after sporangia dehisce; sporangia axillary; spores triangular in polar view with concave faces, surface pitted or grooved. Gametophyte subterranean, cylindric, saprophytic.
10–15 species, primarily northern hemisphere temperate, 2 in Australia.
Source:
Entwisle, T.J. (1994). Ferns and allied plants (Psilophyta, Lycopodiophyta, Polypodiophyta). In: Walsh, N.G.; Entwisle, T.J., Flora of Victoria Vol. 2, Ferns and Allied Plants, Conifers and Monocotyledons, pp. 13–111. Inkata Press, Melbourne.
