Orthotrichum anomalum Hedw., Sp. Musc. Frond. 162. 1801.
Protologue: Germany. In saxis, muris, tetulis, in Germania vulgaris.
Plants small to medium-size, in dense tufts or cushions, red‑brown, yellowish brown or olive‑green. Stems erect, 10–20 mm high, moderately tomentose. Leaves stiffly erect‑imbricate to erect‑patent when dry, erect‑spreading when wet, 2–3 mm long, lanceolate to ovate‑lanceolate, not decurrent; apices acute to rounded‑acute; margins entire, irregularly recurved to near the apex or plane in upper _ and recurved below; costae ending below the apex; upper cells 10–15 μm wide, rounded, isodiametric or irregularly hexagonal, pluripapillose, incrassate, basal cells short to long rectangular, 25–45 μm long, thin‑ or thick‑walled, sometimes nodose, smooth. Gonioautoicous. Setae to 2–3 mm long, twisted when dry. Capsules exserted, cylindric or oblong‑cylindric 1.5–2.0 mm long, 8‑ribbed in upper _, smooth or lightly ribbed below, not contracted below mouth when dry; stomata immersed, in upper to middle regions of capsules, subsidiary cells projecting over the stomata; opercula conic to rostellate, beak erect, 0.5 mm long; peristome single, exostome teeth 16, sometimes united into eight teeth‑pairs, erect, horizontally striate below, vertically striate above. Spores 12–16 μm, roughly papillose. Calyptrae mitrate, 2.5–3.0 mm long, with numerous, erect, papillose hairs.