Photo: BT. Wursten
Description of the genus
Terrestrial or epilithic ferns. Rhizome creeping or suberect to erect. Fronds monomorphic. Stipe and rhachis adaxially sulcate. Lamina pinnately compound, mostly glabrous; veins free, pinnately branched, ending short of the margin. Sori linear, borne medially along the veins or just past a fork; indusium linear to reniform, attached almost along its entire lenght, often with long marginal outgrowths.
Derivation of name: athuréin: alluding to the variable shape of the sori
Worldwide: Near cosmopolitan genus, mostly distributed through the north temperate regions, ± 180 species.
We have 8 taxa in the database for Athyrium.