15. Isopterygiopsis Iwats. 拟同叶藓属 ni tong ye xian shu
J. Hattori Bot. Lab. 33: 379. 1970.
Plants flattened, small, green or yellowish green, glossy. Stems prostrate, subpinnately branched, rhizoids papillose; branches often complanately foliate, with terete and stoloniform branchlets at the tips; in stem cross section epidermal cells inflated, thin-walled, hyaline; central strand developed; pseudoparaphyllia none. Stem leaves and branch leaves similar, complanate, densely and distichously spreading, concave, oblong-elliptic or slenderly lanceolate, not decurrent at base, abruptly narrowed to a shortly filiform apex or gradually acuminate; margins entire, costae double, short or indistinct; leaf cells smooth, linear-flexuous; alar cells not or only slightly differentiated. Dioicous. Perichaetial leaves sheathing at base. Setae elongate, smooth, reddish or orange-yellow; capsules erect or suberect, ellipsoid to cylindrical, symmetric, with short neck, stomata present, constricted below the mouth when dry, smooth; opercula conic, obliquely rostrate; annuli differentiated, in 2 rows; peristome double; exostome teeth yellow and cross-striate below, hyaline and papillose above, bordered, and trabeculate on the inner surface; endostome segments hyaline, perforate, papillose, basal membrane high, cilia 1, filiform, fugacious. Calyptrae cucullate, smooth. Spores spherical, roughened.