2. Acroporium diminutum (Brid.) Fleisch. 针叶顶胞藓 zhen ye ding bao xian
Musci Buitenzorg 4: 1274. 1923. Dicranum diminutum Brid., Bryol. Univ. 1: 814. 1827. Type: Indonesia.
Acroporium subulatum (Hampe) Dix., J. Linn. Soc., Bot. 45: 508. 1922. Pungentella subulata (Hampe) Fleisch., Musci Buitenzorg 4: 1274. 1923. Hypnum subulatum Hampe, Icon. Musc. 9. 1844.
Acroporium scabrellum (Sande Lac.) Fleisch., Musci Buitenzorg 4: 1273. 1923. Hypnum scabrellum Sande Lac. in Dozy & Molk., Bryol. Jav. 2: 214. 1869.
Plants very small, in dense or lax mats. Stems densely branched. Leaves often acicular and incurved when dry, oblong-lanceolate to lanceolate when moist; branch leaves erect-spreading, horizontally patent, occasionally incurved; margins plane, weakly serrulate; leaf cells narrowly rhomboidal, 20–45 mm long, smooth, thick-walled, occasionally low-papillose. Setae smooth or coarse above.