Athyrium Roth
Sori dorsal; indusium us. elongate and curved across veinlet at distal end of sorus, or interrupted at distal end and produced on both sides of veinlet. Sporangia with slender stalks; annulus incomplete, vertical; spores bilateral. Rhizome dictyostelic, us. erect, sts creeping. Stipes with 2 vascular strands us. uniting above. Fronds us. large and decompound, veins rarely anastomosing. In a wide sense a genus of some 600 widely distributed spp., by some split into a number of genera.
