Grimmia orbicularis
BruchAutoicous. Asexual propagules absent. Cushions on rocks, olive-, greyish or blackish green. Stems 1–5 cm long, red-brown, with sparse red-brown rhizoids restricted to base, central strand present. Leaves erect when moist, appressed and twisted when dry, broadly lanceolate, 1.5–2.5 mm long, 0.4–0.75 mm wide, keeled, unistratose; apex acute or obtuse; costa excurrent as a hairpoint or percurrent; hairpoint hyaline, denticulate, to 1.2 mm long; margins entire, recurved mid-leaf on one or both sides; laminal cells in apical half quadrate to short-rectangular, 6–16 μm long, 5–13 μm wide, sinuose, not or slightly incrassate, gradually transitioning to basal laminal cells; basal laminal cells rectangular, often becoming quadrate toward margin, 15–75 μm long, 5–15 μm wide, sinuose near costa. Setae 2–3 mm long, curved, yellowish-brown, smooth, twisted anticlockwise or not. Capsules exserted, erect to pendent, globose to ovoid, 0.9–1.1 mm long, straight. Operculum low-conic or apiculate, 0.2–0.3 mm long. Calyptrae cucullate. Peristome present.
VVP, EGL, EGU. Recorded from three sites in Victoria (Genoa River, near Buchan and near Ballarat) on the rocky sides of rivers or outcrops among dry sclerophyll forest. Also WA, SA, NSW and ACT. Cosmopolitan.