12. Dichodontium Schimp. 裂齿藓属 lie-chi xian shu
Coroll. Bryol. Eur. 12. 1856.
Plants small to medium-sized, yellowish green to dark green, in compact or loose tufts. Stems erect, simple or sparsely branched, often by innovation, radiculose below; central strand present. Leaves contorted to crispate when dry, oblong-lanceolate to ligulate, bluntly acute to rounded-obtuse and irregularly dentate at the apex; margins entire; costa strong, ending below the apex or subpercurrent, with a median row of guide cells, a well developed dorsal stereid band, and a small ventral band in transverse section; upper laminal cells nearly quadrate to rounded-qudarate, papillose-mammillose on both surfaces; lower cells elongate, rectangular, smooth, transparent; alar cells not differentiated. Dioicous. Perichaetial leaves similar to the upper leaves. Setae elongate, stout, smooth; capsules oblong-ovoid, symmetric or slightly curved, erect or inclined, with or without struma; opercula obliquely rostrate; annuli absent; peristome teeth 16, reddish, divided halfway down, basal membrane low, vertically striate below, papillose above. Calyptrae cucullate, entire at base.