6. Mielichhoferia Nees & Hornsch. 缺齿藓属 que chi xian shu
Bryol. Germ. 2(2): 179. 1831. Haplodontium Hampe, Ann. Sci. Nat., Bot., ser. 5, 4: 336. 1865.
Plants usually small, or medium-sized, in loose or dense tufts. Stems often irregularly and sprsely branched, more or less densely foliate. Leaves erect-appressed or imbricate when dry, spreading when moist; oblong-ovate to slenderly lanceolate, abruptly acute to gradually acuminate; margins entire or slightly serrulate above; costae strong, percurrent to shortly excurrent; median leaf cells linear or linear-rhomboidal, thin-walled or thick-walled; marginal cells narrowed; alar cells slightly or more often undifferentiated. Dioicous. Perichaetia lateral, often located at the bases of stems; perigonia lateral; perichaetial leaves rather large. Setae elongate, flexuose; capsules suberect to horizontal, subcylindrical or pyriform, neck well developed, with superficial stomata; annuli well developed; opercula conic, apiculate; peristome variously delicate, often single; exostome teeth linear-lanceolate; endostome (if present) hyaline, fused with very low basal membrane; cilia absent. Calyptrae small, cucullate. Spores spherical.