1. Hypnodendron reinwardtii (Schwaegr.) Lindb. ex Jaeg. & Sauerb.   树灰藓   shu hui xian

Ber. Thätigk. St. Gallischen Naturwiss. Ges. 1877–78: 358. 1880. Hypnum reinwardtii Schwaegr., Sp. Musc. Frond., Suppl. 3, 1: 223. figs. 1–16. 1827. Type: Indonesia. Java, Reinwardt s.n.

Hypnodendron reinwardtii subsp. caducifolium (Herz.) Touw, Blumea 19: 245. 1971. Hypnodendron caducifolium Herz., Hedwigia 61: 292. 1919.

Plants large, stiff, deep green to brownish green, slightly glossy. Primary stems prostrate; secondary stems dendroid, ca. 6–10 cm high, nearly leafless below, with dense rhizoids, pinnately branched above; branches ca. 2.5 cm long. Stem leaves sparse, spreading, squarrose, cordate to ovate-lanceolate, ca. 3.0 mm long, abruptly and slenderly long-acuminate, slightly decurrent at base; margins sharply dentate above, entire below; costae percurrent or ending just below the apex; branch leaves narrowly ovate-lanceolate, concave, ca. 2.5 mm × 0.5–0.8 mm, gradually acuminate, not decurrent at base; margins sharply single- to double-toothed; costae ending in the apex, sparsely dentate at back; median leaf cells irregularly and narrowly rectangular, mostly smooth; basal cells shorter, usually porose. Sporophytes unknown.