1. Scorpidium scorpioides (Hedw.) Limpr. 蝎尾藓 xie wei xian
Laubm. Deutschl. 3: 571. 1899. Amblystegium scorpioides (Hedw.) Lindb., Musci Scand. 33. 1879. Hypnum scorpioides Hedw., Sp. Musc. Frond. 295. 1801. Type: Europe.
Plants rather robust, green, yellowish brown, or reddish brown, glossy. Stems prostrate or ascending, to ca. 25 cm long, unequally or pinnately branched; in cross section cortical cells thick-walled, sometimes hyaline, inflated; central strand weakly differentiated; rhizoids few, reddish brown, often present at base of costa; pseudoparaphyllia few, broad, foliose. Stem and branch leaves similar, more or less imbricate, often strongly secund, 2–3 mm long, strongly concave, broadly ovate, shortly acute or slightly apiculate or cucullate at apex; margins entire; costae double, short, less than 1/6 the leaf length or indistinct; median leaf cells linear, 70–90 µm × 7–10 mm, basal cells shorter, broader, thick-walled, porose; alar cells hyaline, often inflated, thin-walled. Sporophytes not seen.