DENNSTAEDTIACEAE (Bracken Family)
Plants perennial, homosporous. Rhizomes creeping, often branched, hairy (rarely
with scales elsewhere). Leaves variously compound. Veins free, less commonly
anastomosing along the pinnule margins. Sori submarginal to marginal at the
vein tips, the indusia usually present, but sometimes reduced to a low ridge of
tissue, the pinnule margins sometimes also recurved to form a false indusium.
Sporangia with the annulus an interrupted, vertical ring of cells. Gametophytes
green, flat, obcordate to kidney-shaped.
About 20 genera, about 400 species, worldwide.