Range

A genus of about 30 palaeotropical and austral species. Plants terrestrial or epilithic. Rhizome protostelic, wide-creeping, branched. Fronds widely spaced, dorsal, uniseriate, scandent, with indeterminate growth; stipe with a single almost closed C-shaped stele, terete; lamina catadromous, pseudo-dichotomously branched; rachis somewhat flattened adaxially, with an arrested bud between the bifurcations; pinnae unbranched or several times pseudo-dichotomously branched; ultimate branches pinnatifid; segments adnate, herbaceous to coriaceus; stomata of the anomocytic and diacytic types, hypostomatic; venation catadromous, free, forked once. Indumentum composed of stellate hairs and fimbriate scales confined to the rhizome and frond axes. Sori circular, superficial or immersed, on acroscopic vein branch, with 2 to 14 sporangia per sorus, exindusiate. Sporangium stalk multiseriate; annulus oblique, complete. Spores numerous, monolete or trilete, if tetrahedral then with prolonged angles, shallowly rugulose, to 48 (m long. Chromosome number based on 2n = 68.

Range

A genus of about 30 palaeotropical and austral species. Plants terrestrial or epilithic. Rhizome protostelic, wide-creeping, branched. Fronds widely spaced, dorsal, uniseriate, scandent, with indeterminate growth; stipe with a single almost closed C-shaped stele, terete; lamina catadromous, pseudo-dichotomously branched; rachis somewhat flattened adaxially, with an arrested bud between the bifurcations; pinnae unbranched or several times pseudo-dichotomously branched; ultimate branches pinnatifid; segments adnate, herbaceous to coriaceus; stomata of the anomocytic and diacytic types, hypostomatic; venation catadromous, free, forked once. Indumentum composed of stellate hairs and fimbriate scales confined to the rhizome and frond axes. Sori circular, superficial or immersed, on acroscopic vein branch, with 2 to 14 sporangia per sorus, exindusiate. Sporangium stalk multiseriate; annulus oblique, complete. Spores numerous, monolete or trilete, if tetrahedral then with prolonged angles, shallowly rugulose, to 48 (m long. Chromosome number based on 2n = 68.