Polytrichum sexangulare Bridel
Plants small to medium, rather wiry, dark green to reddish brown with age. Stems 1--3(--6) cm, simple, erect or decumbent, the cortical cells thin- or thick-walled. Leaves 3--6 mm, loosely to densely imbricate, erect-incurved at the tips and appressed to the stem when dry, erect-spreading when moist, obtusely cucullate, often secund; sheath broadly elliptic, hyaline-margined, gradually tapering or abruptly contracted to the blade; blade lanceolate to ligulate, almost tubular when dry; costa percurrent or slightly excurrent, cucullate at the apex, rarely bluntly mucronate; marginal lamina 2--6 cells wide, entire to obscurely denticulate, slightly broader and inflexed in the distal part of blade, covering the lamellae; lamellae 5--8(--11) cells high, minutely crenulate in profile, the marginal cells in section larger than those beneath, narrowly ovate to pyriform, smooth or very rarely indistinctly papillose; median sheath cells elongate-rectangular, (18--)24--40 × 8--10(--18) μm; cells of marginal lamina 11--15 μm, quadrate to short rectangular, ± equally thick-walled; perichaetial leaves slightly longer than the foliage leaves. Seta 1.5--3 cm, rather stout, straight or arcuate with age. Capsule 2--3 mm, short-cylindric to ovoid to globose, bluntly (4--)5--6-angled to terete, erect to horizontal to nodding; hypophysis small, scarcely delimited, stomata large and scattered on the lower 1/3 of the urn; exothecium smooth, the cells variable in shape, trigonal to hexagonal, with a diffuse thin spot; peristome pale 220--300 µm high, divided to 0.3--0.5, the teeth 50--64, slender, of uniform size, or short triangular, the alternate teeth smaller. Spores 16--18 μm.
