Sori mostly near upper and outer margin, often united into coenosori and served by 2 or more veinlets. Indusium delicate, broad, attached along base. Sporangia ∞, with slender stalks; annulus straight; spores tetrahedral. Sporangia further protected by modified tooth of lamina. Some 75 spp. (or many more according to limits adopted for genera), mainly tropical in both hemispheres, extending south to Tasmania and N.Z. Rhizome well-developed or short; paleae often hardly distinguishable from hairs. Spelling altered to Lindsaya by Kaulfuss Enum. Fil. 1824, 218.