4. Mielichhoferia sinensis Dix. 中华缺齿藓 zhong hua que chi xian
Hong Kong Natural. Suppl. 2: 15. 7. 1933. Type: China. Western Gansu (Kansu), Lou kia wa, Licent 269.
Plants soft, 10–15 mm high, yellowish green above, brownish at base, not glossy, in dense tufts. Stems erect, simple or branched, with rhizoids at base. Leaves imbricate, ovate to oblong-ovate, not clearly keeled, not decurrent at base, gradually acuminate near apex, 0.8–1.2 mm × ca. 0.3 mm, lower leaves fragile; margins plane or somewhat recurved, entire, bordered by 1–3 rows of narrower cells, thin-walled; costae ending below the apex or nearly percurrent; median leaf cells narrowly rhomboidal or hexagonal, 77–125 µm × 10–20 µm; basal cells narrowly rectangular, similar in size with the median cells. Dioicous. Setae ca. 8 mm long, curved above; capsules pyriform or oblong-pyriform; neck distinct, mouth narrower than urn; opercula semi-conic, bluntly apiculate; annuli persistent; peristome single, with exostomial teeth only. Spores spherical, 12–19 µm.