AppearanceTrophophore stalk 2 to 15 cm, 1--2.5 times length of trophophore rachis; blade green, finely rugulose and convex distally, 2--4-pinnate, to 15 × 26 cm, somewhat herbaceous. Pinnae to 9 pairs, usually approximate, horizontal to ascending, distance between 1st and 2d pinnae not or slightly more than between 2d and 3d pairs, divided to tip. Pinnules obliquely and angularly trowel-shaped to spatulate, margins usually denticulate, apex acute, venation pinnate. Sporophores 2-pinnate, 1--2 times length of trophophore
NamingSceptridium rugulosum (W.H.Wagner) Skoda & Holub 1996
Botrychium rugulosum W.H.Wagner 1982
Botrychium multifidum (S.G. Gmelin) Ruprecht forma dentatum R.M. Tryon
Botrychium ternatum auct. non (Thunb.) Sw. 1801
The name "rugulosum" (Rugulose Grapefern) refers to the tendency of the segments to become more or less wrinkled and convex. Also known as the St. Lawrence Grapefern after its occurrence in the vicinity of the St. Lawrence River watershed in Ontario, Quebec, New York, and Vermont.
DistributionUSA: Connecticut, Michigan, Minnesota, New York, Vermont, Wisconsin
Canada: New Brunswick, Ontario, Prince Edward Island, Quebec
Reports from Connecticut and Prince Edward Island are likely false reports.
StatusGlobal Status: G3
US Status: N3
Canadian Status: N2
Minnesota, Wisconsin: Special Concern
New York: Endangered
HabitatLow and moist habitats in brushy or grassy areas and in open forested areas. Sandy fields and barrens, persisting in young forests.
Some text fragments are auto parsed from Wikipedia.https://en.wikipedia.org/wiki/Botrychium