Flora of New Zealand Series

Thallus chalky white, thin, continuous, sometimes margined by a thin black line. Perithecia common, scattered, minute, 0.2-0.4 mm diam., immersed, to ± superficial, leaving small pits on decay of perithecia, convex, ± carbonaceous- black, fissured, fissures cruciform, resembling a hot-cross bun (×10 lens). Ascospores ellipsoid, 15-21 × 8-10 µm.

N: South Auckland (Pio Pio). S: Canterbury (Weka Pass, Castle Hill, Mt Somers), Otago (Maheno), Southland (Clifden). On limestone rocks.

Cosmopolitan