Northern Prairie Wildlife Research Center
Rather large ferns of moist to wet, wooded habitats; rhizomes stout, scaly. Fronds alike or somewhat dimorphic, the sterile ones sometimes persisting over winter, glabrous, the blades pinnate-pinnatifid to tripinnate, ultimate segments commonly toothed or lobed; veins free, simple to once or twice dichotomous; petioles shorter than the blades, stramineous, bearing membranous scales. Sori round, occurring at regular intervals on the backs of the ultimate segments; indusium reniform, attached at its center in the middle of the sorus.
|1||Blades bipinnate-pinnatifid to nearly tripinnate||D. carthusiana|
|1||Blades pinnate-pinnatifid to nearly bipinnate||D. cristata|