3. Clastobryopsis robusta(Broth.) Fleisch. 粗枝拟疣胞藓 cu zhi ni you bao xian
Musci Buitenzorg 4: 1181. 1923. Aptychella robusta (Broth.) Fleisch., Musci Buitenzorg 4: 1671. 1923. Clastobryum robustum Broth., Philipp. J. Sci. 5: 155. 1910. Type: the Philippines. Luzon, McGregor 8912.
Clastobryum heterocladum (Fleisch.) Dix., J. Bot. 79: 74. 1941. Aptychella heteroclada (Fleisch.) Fleisch., Musci Buitenzorg 4: 1671. 1923. Clastobryopsis heteroclada Fleisch., Musci Buitenzorg 4: 1181. 1923.
Plants coarse, brownish green, loose or in dense mats. Main stems prostrate, irregularly branched, branches 0.8–2.7 cm long with leaves loosely arranged, erect, sometimes with broad, complanate caudate apices. Leaves erect-patent, stem leaves ovate-lanceolate, branch leaves broadly ovate, frequently plicate, with slender acumina, broadly decurrent at base, often concave, more than 2 mm long; leaf margins involute throughout, strongly involute near acumen, entire or weakly toothed; costae double, short and faint, sometimes absent; upper branch leaves broadly ovate, strongly concave, margins not involute; leaf cells narrowly oblong to linear, 45–60 mm × ca. 5 mm, strongly thickened, often pitted, smooth; alar cells brownish to purple, numerous, quadrate or rectangular, unevenly thickened, not all cells inflated. Propagula brown, smooth, borne in leaf axils, composed of 16–22 cells. Sporophytes not seen.