Flora of New Zealand Series

Aquatic plants with free-floating, slender, branching stems. Vernation non-circinate. Sporangia aggregated into sori; sori enclosed by a sporocarp (modified indusium) and containing either mega- or microsporangia. Annulus 0. Heterosporous, producing 1 megaspore per megasporangium and a few microspores per microsporangium; spores lacking chlorophyll.

2 genera, widespread in tropics and subtropics.