2. Brachydontium Bruch ex Fürnr. 短齿藓属 duan-chi xian shu
Flora 10 (2) Beibl : 37. 1827.
Plants very small, yellowish green or brownish green, gregarious or in loose tufts. Stems erect, usually simple. Leaves long-subulate from a narrowed base; margins entire; costa thick, long-excurrent, often filling most of the subula; upper cells subquadrate, smooth; basal cells longer; alar cells not differentiated. Autoicous. Setae elongate, yellowish, straight or somewhat cygneous above; capsules exserted, erect, symmetric, oblong-cylindric, striate; opercula rostrate; annuli large, compound, in 2–3 rows; stomata present, small; peristome (endostomal segments) 16, very short, not or slightly exceeding the annuli, hyaline, papillose. Calyptrae narrowly conic-mitrate, divided at the base into 3–5 spreading lobes, smooth or obscurely plicate above. Spores spherical.