4b. Hygrohypnum luridum var. subsphaericarpum (Brid.) C. E. O. Jensen in Podp. 水灰藓圆蒴变种 shui hui xian yuan shuo bian zhong
Consp. Musc. Eur. 572. 1954. Hygrohypnum palustre var. subsphaericarpon (Brid.) Loeske, Moosfl. Harz. 320. 1903. Hypnum subsphaericarpon Schleich. ex Brid., Muscol. Recent. Suppl. 2: 232. 1812. Type: Europe.
Plants medium-sized, rather robust, dark green or brownish green, in loose mats. Stems prostrate, to 5–6 cm long; central strand weakly differentiated; pseudoparaphyllia absent. Stem leaves large, imbricate, oblong, abruptly narrowed to a short acumen; margins entire; costae single, strong, ending in the leaf apex or nearly subpercurrent; median leaf cells 30–40 mm × ca. 4 mm, vermicular, thick-walled; alar cells numerous, quadrate to rectangular, hyaline. Autoicous. Inner perichaetial leaves elongate-lanceolate, 3–4 mm × ca. 0.6 mm, plicate; costae thick, reaching ca. 2/3 the leaf length. Setae 15–20 mm long, reddish brown; capsules reddish brown, erect, shortly ovoid to subglobose; endostome segments carinate, smooth or minutely papillose; cilia 2–3, shorter than or as long as the segments, nodulose. Spores large, 25–30 mm in diameter, papillose.