Flora of New Zealand Series

Verrucaria biformis Borrer., in Hook. et Sowerby, Engl. Bot. Suppl. 1: t. 2617 (1831).

Thallus white, thin to effuse, cracked or ± continuous. Perithecia scattered to crowded, occasionally fused, hemispherical to subglobose very small, 0.25-0.5 mm diam., leaving shallow pits. Asci cylindrical, clavate, with a thick wall at tip, dimple at apex 4 µm diam., 150 × 12 µm. Ascospores irregularly uniseriate sometimes ± biseriate, ellipsoid, 1-septate, 12-16 × 5-7 µm, both cells equal, often with oil droplets.

N: S: Throughout, on introduced trees (Betula, Prunus) in urban areas.

Cosmopolitan