Dennstaedtiaceae Lotsy
Sori terminal on veinlets; indusium cup-shaped or 2-lipped, lower lip sts lacking. Sporangia graduate or mixed; annulus oblique to nearly vertical; spores tetrahedral. Rhizome creeping, solenostelic, bearing hairs but not paleae; stipes not articulated to rhizome; vascular strand about U-shaped. Lamina compound; much dissected. Prothallus cordate. About 10 genera of wide distribution.
Key
1
Sori protected by modified seg. of lamina and by delicate indusium attached to lamina at base
