Plants with shoots 10 30 × 1.5 2.4 mm. Leaves circular to reniform in outline, about as wide as long or wider, 0.6 0.9 × 0.7 1 mm, entire with rounded apices, distal leaves occasionally retuse; median leaf cells 30 35 × 24 30 µm, marginal cells smaller, 20 30 µm, oil bodies 2 3 per cell, ovoid to ellipsoid, 8 15 × 6 7 µm, homogeneous, hyaline, glistening, becoming 2 3 segmented with age.

Moist to dripping non calcareous rocks and along stream banks in Spruce Fir or Arctic; e, w, and s Greenland; B.C., Labrador, N.B. Nfld., N.S., Yukon; Alaska, Maine, N.C., Oreg., Tenn., Wash., Wyo.; Europe; Asia; Atlantic Islands (Iceland).