Andreaea rupestris Hedw.

Plants small, forming cushions, red-brown to black-green; saxicolous. Stems 5-20 mm high, irregularly branched; in section round, central strand absent, inner cortical cells in 2-3 rows, corners thickened, outer cells in 2 rows, smaller, round, incrassate. Leaves appressed or with spreading apices dry, erect-spreading wet; ovate to oblong-lanceolate, occasionally constricted above base, 0.3-1.5 mm long; apex weakly cucullate, acute to obtuse; margins entire, incurved; lamina in section unistratose. Costa absent. Upper laminal cells quadrate, incrassate, frequently with strongly thickened corners, smooth to strongly papillose on dorsal surface; basal cells linear to rectangular, irregularly thickened; basal marginal cells short-rectangular to quadrate. Autoicous. Perichaetia terminal; leaves elliptical, 2 mm long; apex obtuse. Pseudopodia 1-2 mm long, pale green; capsule just exserted, elliptical, to 1 mm long, dark red-brown; dehiscence slits extending from mid-capsule to near apex; spores round, 20-25 µm, yellow, weakly papillose.