20. Dicranum muehlenbeckii Bruch & Schimp. in B.S.G. 细叶曲尾藓 xi-ye qu-wei xian
Bryol. Eur. 1: 142. 1847. Type. Switzerland: Mühlenbeck s.n. 1844.
Dicranum neglectum auct. non Jur. ex De Not., Atti Reale Univ. Genova 1: 613. 1869. Dicranum muehlenbeckii var. neglectum auct. non (De Not.) Pfeff., Neue Denschr. Schweiz. Naturf. Ges. 4: 23. 1869.
Dicranum spadiceum auct. non Zett., Kongl. Svenska Vetensk. Acad. Handl. 5(10): 20. 1865.
Plants medium-sized, 2–4 cm high, yellowish green or brownish green, not or somewhat shiny, in compact tufts. Stems erect or ascending, simple or branched, tomentose below. Leaves crispate when dry, erect-patent or slightly secund when moist, ovate-lanceolate, 8–10 mm × 1 mm, gradually narrowed from an oblong-ovate base to slender, or subulate, channeled acumen; margins plane below, involute above, double-toothed and bistratose in the upper part; costa stout, occupying 1/5–1/4 the leaf base width, percurrent or shortly excurrent, not particularly ridged at back, smooth or somewhat serrulate near the tips; upper cells quadrate to rounded quadrate, incrassate, not porose, somewhat mammillose at back; basal cells elongate, rectangular, thick-walled, porose; alar cells quadrate, slightly inflated, bistratose, deeply brownish. Dioicous. Male plants dwarfed. Setae single or sometimes two per perichaetium, straight, 2.5–3.0 cm long, yellowish; capsules cylindric, curved, urns ca. 3 mm long, sometimes strumose at base, more or less furrowed when dry and empty; opercula obliquely long-rostrate, ca. 2 mm long; annuli in 1 or 2 rows of large cells, deciduous; peristome teeth lanceolate, divided to the middle, reddish brown, papillose above, vertically striolate below. Spores 18–20 µm in diameter, minutely papillose.