2. Duthiella Müll. Hal. ex Broth. 绿锯藓属 lu ju xian shu
Nat. Pflanzenfam. I(3): 1009. 1908.
Matsumuraea S. Okamura, Bot. Mag. (Tokyo) 28: 106. 1914.
Plants soft, green, yellowish green to dark green, not or slightly glossy, in small flattened mats. Primary stems creeping, with dense, reddish brown rhizoids; secondary stems prostrate, ascending, rarely dendroid, irregularly pinnately branched, complanately foliate; central strand present or absent; pseudoparaphyllia absent. Stem and branch leaves similar, only different in size, often crisped when dry, erect-spreading when moist, ovate or broadly ovate at the base, gradually narrowed to a shortly acuminate apex, slightly decurrent at the base, sometimes rounded or auriculate; margins grossly serrate above, subentire to serrulate below; costae single, slender, ending above mid-leaf; upper and median leaf cells hexagonal, rhombic, or elongate-rhomboidal, thin-walled, with 1–3 or more minute papillae on both surfaces; basal cells rounded-hexagonal; alar cells scarcely differentiated. Dioicous. Perichaetia lateral on secondary stems or branches. Inner perichaetial leaves sheathing at the base, slender above. Setae elongate, up to 5 cm long, smooth; capsules oblong-ovoid, slightly inclined, with a short apophysis; opercula conic, obliquely shortly rostrate; annuli not differentiated; peristome double; exostome teeth 16, lanceolate, yellowish, papillose; endostome segments narrowly lanceolate, keeled, perforate, papillose; basal membrane high; cilia 3, nodulose. Calyptrae small, cucullate, smooth. Spores spherical, light yellow, minutely papillose.