Bartramia circinnulata Müller Hal. & Kindberg; B. crispa Bridel; B. glaucoviridis Müller Hal. & Kindberg

Plants in lax to dense tufts, green to glaucous, sometimes yellowish green. Stems 0.5-8 cm. Leaves flexuose to crisped when dry, laxly erect to erect-spreading when moist, narrowly lanceolate to linear, 4-7 mm; base scarcely sheathing, shoulders well developed, firm; margins revolute, coarsely toothed distally, teeth paired; apex subulate; costa excurrent, prominent, distal abaxial surface rough; basal laminal cell walls thin; medial and distal cells 4-15 × 4-8 µm, prorulae high. Sexual condition autoicous or synoicous. Seta 0.5-2.5 cm, flexuose. Capsule inclined, globose to ovoid, asymmetric, 1.5-2.5 mm; operculum conic convex; peristome double; exostome teeth 375-450 µm, granulose-papillose throughout; endostome basal membrane high, segments somewhat shorter than teeth, finely seriate-papillose, cilia rudimentary. Spores 20-26 µm.

Capsules mature Feb-Nov. Soil, rock, base of trees, downed trunks, moist shady forests; low to moderate elevations (0-1100 m); Greenland; B.C., N.B., Nfld. and Labr., N.S., Nunavut, Ont., Que., Sask.; Ala., Alaska, Ark., Calif., Conn., Del., D.C., Ga., Idaho, Ill., Ind., Iowa, Kans., Ky., Maine, Md., Mass., Mich., Minn., Miss., Mo., Mont., Nebr., N.H., N.J., N.Y., N.C., N.Dak., Ohio, Okla., Oreg., Pa., R.I., S.C., S.Dak., Tenn., Vt., Va., Wash., W. Va., Wis.; s South America (Tierra del Fuego); Europe; n, c, e Asia; n Africa; Atlantic Islands (Madeira).

Bartramia pomiformis can be distinguished from the similar B. halleriana by the combination in the former of narrowly lanceolate to linear-lanceolate leaves, often crisped or flexuose when dry, together with the elongate seta that usually lofts the capsule above the foliage.