Greek onos - vessel, kleto - to close; referring to the closely rolled fertile fronds.

Rhizome long-creeping, underground; scales few, papery, entire. Sterile and fertile fronds different. Fertile fronds with segments beaded and in flower-like spikes, divided 1-2 times. Sterile fronds to 50 cm or so long; blade ovate-triangular in outline. Segments with irregular wavy edges; veins netted. Sori round. Indusium cup-like.

A genus of somewhat uncertain position but now generally included in the family Dryopteridaceae.

Propagation: Division or spores.

Literature: Lloyd (1971).

1 species from E North America and E Asia.

Created by: Val Stajsic

Updated by: Val Stajsic, May 2018