Trophophore stalk 0--2 cm, 0 to 1/5 length of trophophore rachis; blade dull green, oblong to linear, 1-pinnate, to 10 / 2.5 cm, firm to herbaceous. Pinnae to 10 pairs, horizontal to slightly spreading, approximate to remote, distance between 1st and 2d pinnae not or slightly more than between 2d and 3d pairs, basal pinna pair approximately equal in size and cutting to adjacent pair, occasionally basal pinnae and/or some distal pinnae elongate, lobed to tip, nearly circular, fan-shaped or ovate, sides somewhat concave, margins nearly entire, shallowly crenate, occasionally pinnately lobed or divided, apex rounded, venation like ribs of fan with short midrib. Sporophores 1-pinnate, 2-pinnate in very large, robust plants, 1.5--2.5 times length of trophophore. 2 n =180. Leaves appearing in spring through summer. Widely scattered; 0--3700 m; St. Pierre and Miquelon; Alta., B.C., Man., N.B., Nfld., N.W.T., N.S., Ont., P.E.I., Que., Sask., Yukon; Alaska, Ariz., Calif., Colo., Idaho, Maine, Mich., Minn., Mont., Nev., N.H., N.Y., N.Dak., Oreg., Utah, Vt., Wash., Wis., Wyo. Specimens of Botrychium minganense have sometimes been misidentified as B . dusenii (H.Christ) Alston, a South American species.