Pleuridium subulatum (Hedw.) Rabenh., Deutschl. Krypt.-Fl. 2(3): 79. 1848; Phascum subulatum Hedw., Sp. Musc. Frond. 19. 1801.
Pleuridium acuminatum auct. non Lindb., Ö fvers. Förh. Kongl. Svenska Vetensk.-Akad. 20: 406. 1863.
Plants very small, only up to 5 mm high, yellowish green or yellowish brown, in loose tufts. Stems erect, slender, simple. Lower leaves small and distant, the upper ones larger and crowded, loosely erect or subsecund, 3.0–3.5 mm long, gradually tapered from a narrowly ovate base to a linear or subulate acumen; margins plane or slightly incurved above the middle, serrulate near the apex; costa strong, nearly filling the entire subula; upper cells linear-rectangular, 13–20 µm × 4–6 µm, thin-walled; basal cells rectangular, 15–40 µm × 5–7 µm, thin-walled, pellucid. Autoicous. Perichaetial leaves similar to the upper stem leaves or slightly larger. Setae very short; capsules immersed, subglobose to ovoid, immature. Calyptrae cucullate. Spores not seen.
Chinese specimens examined: SHANGHAI: She-shan (Mt.), D.-K. Li 7491 (SHM).
Habitat: on soil in open fields; Distribution: China, Japan, Europe, and North America.
Illustrations: C. Gao (ed.) 1994 (Pl. 28, figs. 1–7).