Plants pale green. Stems pinnate, flabellate, palmate, or umbellate, rudimentary branches absent; stipe cavities absent. Leaves margins bordered by 1 or 2 rows of long-rhomboidal cells; apex acute or acuminate; costa of lateral frond leaves ending before apex; laminal cells rhomboidal, prosenchymatous, walls thin or weakly incrassate. Specialized asexual reproduction absent.

Distribution

North America, Mexico, West Indies, Central America, South America, Europe, Asia, Africa, Indian Ocean Islands, Pacific Islands, Australia.

Discussion

Species 26 (2 in the flora).

Selected References

None.

Lower Taxa

Hypopterygium flavolimbatum, Hypopterygium tamariscina

Key

1	Dorsal frond leaves present on basal portion of stipe; stipe and basal frond leaves in 8 rows; paraphyses absent.	Hypopterygium flavolimbatum
1	Dorsal frond leaves absent from stipe; stipe and basal frond leaves in 3 or 11+ rows; paraphyses present.	Hypopterygium tamariscina