5. Ctenidium homalophyllum Broth. & Yas. ex Iishiba 平叶梳藓 ping ye shu xian
Classif. Mosses Japan 73. 1932. Type: Japan. Inaba, Ikoma 254.
Hyocomium scabrifolium Broth. in Paris, Bull. Herb. Boissier, ser. 2, 2: 993. 1902, nom. nud.
Plants medium-sized, dark green, sometimes yellowish green. Stems prostrate, somewhat ascending, ca. 2.5 cm long, pinnately or irregularly pinnately branched; branches dense or remote, flattened, rarely erect, sometimes curved at apex, ca. 8 mm long; pseudoparaphyllia triangular to narrowly triangular, shortly acuminate. Stem leaves erect or erect-spreading, slightly falcate, ovate-lanceolate, 1.3–1.6 mm × 0.70–0.98 mm, shortly to rarely slenderly acuminate, cordate at base, shortly decurrent, rarely plicate; margins recurved above, serrulate; costae double, reaching 1/3–1/2 the leaf length; median leaf cells 40–60 µm × 5–6 µm, prorate, thick-walled; alar cells rectangular, somewhat porose, decurrent alar cells slightly differentiated, mostly narrowly rectangular; branch leaves erect-spreading, 0.9–1.5 mm × 0.3–0.6 mm, ovate- or elliptic-lanceolate, shortly acuminate. Dioicous. Inner perichaetial leaves erect-ovate to triangular-lanceolate, sometimes asymmetric at base, not plicate, slenderly acuminate, serrulate above, costae double, ca. 1/3 the leaf length or indistinct, median cells thick-walled, slightly prorate. Setae ca. 2 cm long, reddish brown, smooth; capsules horizontal, 1.2–1.4 mm × 0.7–0.9 mm, ellipsoid to cylindrical, slightly curved; opercula shortly rostrate. Spores ca. 20 µm in diameter.