Trichostomum tenuirostre (Hook. & Taylor) Lindb.

Plants small to medium, loosely caespitose, yellow-green; terricolous or saxicolous. Stems 5-10 mm high, occasionally branched above; in section round, central strand absent, cortical cells incrassate, smaller toward margin; axillary hair long, to 20 cells, hyaline throughout. Leaves crowded above, incurved, contorted to spirally twisted dry, erect-spreading wet, frequently fragile or broken; linear-lanceolate or narrowly ligulate, 2.5-4.5 mm long; apex acute to narrowly acuminate; margins plane, entire. Costa percurrent to short-excurrent, ventral superficial cells quadrate, papillose, dorsal superficial cells narrowly rectangular, smooth; in section semicircular, guide cells 4-5, ventral stereid band strong, 2-3 cells thick, ventral surface cells small, similar to laminal cells, dorsal stereid band 2-4 cells thick, dorsal surface cells undifferentiated or sub-stereids. Upper laminal cells quadrate to short-rectangular, incrassate, papillae low, blunt, 4-8 over lumen; basal cells rectangular, hyaline, smooth, thin-walled, junction with laminal cells straight across leaf or occasionally extending a short distance up margin. Dioicous. Perichaetia terminal, leaves short, base broader than vegetative leaves. Seta 6-8 mm long, yellow; capsule cylindrical, 2 mm long, reddish yellow; peristome variable, erect or weakly twisted, teeth filiform, occasionally perforated or divided above, papillose; operculum long-rostrate, 0.8 mm long; calyptra cucullate, 2 mm long; spores round, 8-12 µm, granulate.