Andreaea rupestris Hedw., Sp. Musc. Frond. 47. 1801.
Syntypes. Sweden, England, "Bructeri" and Germany, sin. coll.
Plants small to medium sized, 1–3 cm high. Leaves frequently with a whitish bloom, 1–2 mm long, crowded, spreading to appressed when dry, ovate- to oblong-lanceolate, weakly constricted and panduriform above the base, concave; apices acute to bluntly acute; margins thick, erect, entire (perichaetial leaves shortly and bluntly dentate); ecostate; upper median cells 15–19 µm × 10 µm, short-rectangular, upper marginal cells quadrate, median cells distinctly longer than the marginal cells, strongly incrassate, and porose throughout, the upper cells with stellate lumina commonly with large, thick papillae on the dorsal surface (occasionally on ventral), basal cells 50–75 µm × 10 µm, long rectangular. Sporophytes not seen in Central America.