7. Schlotheimia Brid. 火藓属 huo xian shu
Muscol. Recent. Suppl. 2: 16. 1812. Macromitrium sect. Schlotheimia (Brid.) Müll. Hal., Bot. Zeitung (Berlin) 3: 541. 1845.
Plants small to medium-sized, elongate, slender or rather robust, yellowish green to brown, dark red or rusty reddish when dry, in dense mats. Primary stems extensively creeping, with abundant rhizoids throughout stem, simple or branched, sometimes with many erect or ascending branches. Leaves appressed, often spirally arranged when dry, erect to erect spreading, flexuose at the apex when moist, usually undulate in the upper part, mostly elongate-lingulate, shortly cuspidate, sometimes lanceolate, long acuminate; margins usually entire; costae shortly excurrent, sometimes ending in awns; upper leaf cells rounded or shortly rhombic, often thick-walled, smooth; basal cells elongate, linear-rhomboidal, thick-walled, often porose. Dioicous. Perichaetial leaves not differentiated or only slightly larger, shortly acute or ending in a short awn. Setae straight, rarely curved, sometimes very short; capsules erect, symmetric, ovoid or cylindrical, smooth or furrowed; opercula shortly conic, with a slender and long rostrate; annuli not differentiated; peristome double; exostome teeth hydrotropic, red, reflexed when dry, narrowly lanceolate, obtuse, with dense ridges and papillae, longitudinally splitting along the median line; endostome segments short and narrow, pale, longitudinally striolate, sometimes reduced. Calyptrae mitrate, not plicate, mostly naked, rarely hairy, usually lobed at the base. Spores spherical, papillose.