Canad. Rec. Sci. 6: 72. 1894.
Plants small or medium-sized, green or sometimes yellowish green to yellow. Stems creeping, irregularly pinnate; paraphyllia sometimes present, 1-seriate, narrowly triangular or ovate. Stem leaves spreading or ± squarrose, 1–2.3 × 0.4–1 mm; base erect to erect-spreading, cordate or rounded-triangular; acumen frequently differentiated, constituting 55–77% leaf length. Sexual condition dioicous.
Habitat: Mineral-rich wetland habitats, lowlands in swampy forests, open habitats at higher elevations, lake and stream shores
Elevation: low to high elevations
Greenland, Alta., B.C., Nfld. and Labr. (Labr.), N.W.T., N.S., Ont., Que., Yukon, Alaska, Colo., Idaho, Ill., Ind., Maine, Mass., Mich., Minn., Mont., Utah, Wash., Wis., Wyo., Eurasia.