Entosthodon attenuatus (Dicks.) Bryhn, Kongel. Norske Vidensk. Selsk. Skr. (Trondheim) 1908(8): 25. 1908.
Bryum attenuatum Dicks., Fasc. Pl. Crypt. Brit. 4: 8. 1801. Funaria attenuata (Dicks.) Lindb., Not. Sällsk. Fauna Fl. Fenn. Förh.11: 633. 1870. Protologue: Scotland. Habitat in paludibus montosis Scotiae.
Plants yellow‑green, usually gregarious in lax to dense tufts. Stems erect, 2–5 mm tall, sparsely branching by subperigonial innovations, usually naked at very base (except for rhizoids), the leaves more or less clustered toward stem apices, with a single‑layered sclerodermis over 1–2 rows of small reddish thick‑walled cells, subtended by abruptly larger thin‑walled cells, central strand well developed. Leaves erect‑spreading when dry, slightly contorted, wide‑spreading when moist, oblanceolate to oblong‑obovate, cuspidate, 1–2 mm long, concave, not decurrent; margins bluntly serrulate above, subentire below, plane; costa subpercurrent; upper cells subquadrate to hexagonal to short‑rectangular, thin‑walled, smooth, (34–)51–85 x 20–42 μm, differentiated at the margins with 1–2(–3) rows of narrow, elongate, yellowish cells, more or less confluent in the apex, disappearing toward the insertion, basal cells long‑rectangular, 100–240 x 34–57 μm, sometimes more or less inflated, alar cells not differentiated. Autoicous. Setae orange to reddish brown, straight to slightly flexuose, weakly hygroscopic, smooth, 0.8–1.4 cm long. Capsules reddish brown, narrowly oblong‑pyriform, neck 1/2 the capsule length, erect to inclined, somewhat asymmetric from a bend in the neck, somewhat constricted below the mouth when dry, wrinkled to sulcate in the neck, smooth above, 2–2.8 mm long; stomata phaneroporous, numerous in neck; opercula plano‑convex, cells subquadrate, thick‑walled, in more or less regular, straight vertical rows; annuli simple; peristome double, inserted well below the mouth, exostome teeth red‑brown, straight, 150 x 40 μm, acute or irregular at apex, papillose to papillose‑striate, endostome rudimentary, hyaline and weakly papillose, basal membrane short, segments short and blunt, projecting just above the capsule mouth, segments wider than teeth. Spores more or less angular, (22–)28–34 μm in diameter, very finely but densely roughened, without trilete scars. Calyptrae cucullate‑rostrate, 2–2.5 mm long, naked, smooth.