5. Hypopterygium japonicum Mitt. 东亚孔雀藓 dong-ya kong-que xian

J. Proc. Linn. Soc., Bot. 8: 155. 1864. Type. Japan.

 

Plants loosely tufted. Primary stems prostrate, with dense rhizoids; secondary stems erect, erect-spreading above, complanately branched, dendroid, ca. 3–4 cm high, ca. 3 cm wide with leaves. Lateral leaves broadly ovate, slightly asymmetric, 0.9–1.6 mm long, with acute apex, leaf margins bordered by 1–2 rows of narrowly elongate cells, serrulate above; costa single, reaching 3/5 the leaf length; laminal cells rhomboidal-hexagonal, 18–25 µm × 11–14 µm; amphigastria 0.4–1 mm × 0.2–0.8 mm, with short acuminate apex, margins bordered by 1–2 rows of narrowly elongate cells, nearly entire; costa ending below leaf apex or percurrent. Setae erect, ca. 1.5 cm long; capsules oblong-cylindrical, ca. 2.8 mm long; opercula conical, long-rostrate.