Flora of New Zealand Series

Terrestrial or sometimes epiphytic plants. Stems creeping, erect or epiphytic, bearing long roots. Lvs simple, single-veined, with a ligule on adaxial surface. Sporangia solitary on adaxial surface of a sporophyll, aggregated into strobili. Heterosporous; spores lacking chlorophyll. Gametophytes minute, endosporic.

1 living genus, chiefly in warm temperate to tropical regions but almost cosmopolitan.