4. Hypopterygium formosanum Nog. 台湾孔雀藓 tai-wan kong-que xian
Trans. Nat. Hist. Soc. Formosa 26: 148. pl. 3, f. 9–13. 1936. Type. China: Taiwan, Tai-nan Co., Mt. Kodama, Noguchi 7200.
Primary stems creeping, secondary stems loosely tufted, yellowish green, not glossy, 3–5 cm high, complanately branched, dendroid. Stem leaves ovate, symmetric, with a short acute apex. Lateral leaves elongate-ovate, asymmetric, ca. 1.2 mm × 0.8 mm, with shortly acute apices; leaf margins bordered by 1–2 rows of narrowly elongate cells, serrate throughout; costa single, reaching 2/3 the leaf length; laminal cells rhomboidal-hexagonal, ca. 22 µm × 11 µm, hyaline; amphigastria small, broadly ovate, symmetric, ca. 0.8 mm × 0.5 mm, with slender and short acumens, leaf margins bordered, serrulate above; costa thin, soft, mostly ending below the apex. Setae long, curved at tops; capsules shortly cylindrical, inclined; exostome teeth elongate-lanceolate; endostome segments papillose; basal membrane high; cilia well developed; opercula shortly conical. Calyptrae mitriform, smooth. Spores not seen.