In crevices on limestone wall. Darker patches on lamina are bistratose areas.
Epiphyte, with gemmae covering margins and nerves of thalli tips.
On sandy soil on bank of ditch. Shoots up to 2cm tall, leaves about 5mm long. Midleaf lamina up to 14 cells wide. Between 20 and 27 lamellae, only 4 cells high.
Epiphyte on branch with Metzgeria violacea. Outer peristome teeth are red