Dryopteris clintoniana is a large fern, with blades 45-100
cm long and 12-20 cm wide. Blades are pinnate-pinnatifid. The
basal pinnae are much smaller than those above and are elongate-triangular
in shape. Fertile leaves die in winter, but sterile leaves do
D. clintoniana ranges from New Brunswick and New Jersey
west to Michigan and Indiana. It is very rare in Wisconsin, known
from only two locations in the southeastern portion of the state
and it has been identified as a "special concern"
species. Habitat is wet woods.