New York Fern (Thelypteris novaboracensis)
2008-7-4 Finger Lakes, NY
Shorter than Cinnamon Fern and, where Cinnamon Fern would show separate spore-bearing fronds (dimorphic) at this time of year , the New York Fern doesn't because its spores are beneath, on the the underside of, the leaves (monomorphic).
http://ohioplants.org/ferns/