Plants gregarious or tufted, green to brownish, often somewhat uncinate-curved at tips when dry, to 5 mm. Leaves dimorphic, the vegetative 2-3 mm; distal lamina broadly to narrowly lanceolate; margins somewhat thickened and toothed distally; costa in cross section showing ad- and abxaxial bands of stereid cells; medial cells obscure or distinct, 5-6 µm, minutely papillose ad- and abaxially; teniolae usually distinct at leaf shoulders and beyond but sometimes weak or interrupted; cancellinae usually broadly rounded distally, adaxial distal cells distinctly mammillose; gemmiferous leaves with apex of costa excurrent, bearing gemmae all around on apex of costa.
2. Calymperes erosum C. Müll. 圆网花叶藓 yuan-wang hua-ye xian Linnaea 21: 182. 1848. Type. Suriname: Kegel s.n. (holotype GOET; isotype PC). Calymperes fordii Besch., Ann. Sci. Nat. Bot., sér. 8, 1: 284. 1896. Type. China: Hong Kong (C. Ford, in herb. de Poli, no. 140) (isotypes FH–Fleischer, NY). Plants blackish proximally, yellowish green distally, sometimes forked, in low dense turfs. Stems evident; rhizoids brown to glossy blackish red. Leaves essentially monomorphic, vegetative leaves grading into gemmiferous leaves, mostly little-contorted and appressed-secund when dry, bases conspicuous and with metallic hue, erect-spreading when wet, lanceolate to narrowly or broadly acuminate above broader base, to 4–5 mm long, axillary hairs inconspicuous; costa excurrent in gemmiferous leaves; median cells of upper laminae isodiametric, nearly smooth to sharply papillose abaxially, bulging to mammillose-papillose adaxially; margins more or less thickened and toothed distally; teniolae usually conspicuous; at least some (often most) distal cells of cancellinae distinctly mammillose, with mammillae pointing distally, adjacent green cells of upper laminae also mammillose. Gemmae common, in reddish spherical clusters borne all around on excurrent tip of costa. Sporophytes not seen.