Plants on rock or terrestrial, forming cushionlike mats. Stems decumbent to short-creeping, dry stems readily fragmenting, irregularly forked, without budlike arrested branches, tips straight; main stem upperside and underside structurally slightly different, inconspicuously indeterminate, lateral branches radially symmetric, determinate, strongly ascending, 1-forked. Rhizophores borne on upperside of stems, throughout stem length, 0.2--0.33 mm diam. Leaves monomorphic, in alternate pseudowhorls of 4, tightly appressed, ascending, green, linear-oblong to linear-lanceolate, seldom lanceolate-elliptic, sometimes falcate on lateral ranks (on main stem), 2--4.25 X 0.45--0.75(--1) mm (smaller on young ascending branches); abaxial ridges present; base cuneate and decurrent, rarely rounded and adnate, glabrous, seldom slightly pubescent; margins short-ciliate or denticulate to entire, cilia few, transparent, scattered, ascending to spreading, 0.02--0.1 mm; apex keeled, attenuate or obtuse, blunt or acute or ending in a very short bristle or mucro; bristle or mucro transparent to opaque, yellowish or whitish, smooth, 0--0.4 mm. Strobili solitary, 0.5--2 cm; sporophylls lanceolate to ovate-lanceolate, abaxial ridges moderately defined, base glabrous, margins short-ciliate to denticulate, apex short-bristled.
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