Stem rounded-pentagonal in section. Leaves flattened, lanceolate, distal margins plane, entire or weakly toothed, not bordered; apex acute, plane or keeled; basal cells differentiated across leaf base as a U or V, commonly running up margins, not distinctly enlarged submarginally; distal laminal cells pluripapillose with low papillae; mucro conic, of 3–6 cells. Sexual condition dioicous. Peristome teeth bluntly lanceolate.

Distribution

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Widely distributed in temperate and high-elevation tropical areas of the world, ranging into the Arctic.

Discussion

Varieties 2 (2 in the flora).

1. Gemmae absent

3a. Trichostomum tenuirostre var. tenuirostre

1. Multicellular gemmae on rhizoids from adaxial surface of the costa or in soil

3b. Trichostomum tenuirostre var. gemmiparum

Selected References

None.

Lower Taxa

Trichostomum tenuirostre var. gemmiparum, Trichostomum tenuirostre var. tenuirostre

Key

1	Gemmae absent.	Trichostomum tenuirostre var. tenuirostre
1	Multicellular gemmae on rhizoids from adaxial surface of the costa or in soil	Trichostomum tenuirostre var. gemmiparum