Arthothelium stirtianum Müll.Arg.
Arthonia cinerascens var. crustosa Stirton, Proc. phil. Soc. Glasg. 10: 306 (1877).
Lectotype: New Zealand. Near Wellington. J. Buchanan, GLAM!
Thallus pale glaucous grey, minutely areolate-cracked, areolae plane to subconvex, matt or minutely granular-furfuraceous, spreading in indeterminate patches 1-4 cm diam., delimited by a fine black line. Ascocarps frequent, minute 0.1-0.6 mm diam., black, carbonaceous, plane to slightly raised above surface of thallus or ± innate, round to irregular, solitary or 2-3 confluent, often with a thin veil of cortex adhering. Ascospores 2 per ascus, colourless to brown, muriform, ellipsoid to oblong 30-40 × 12-20 µm.
N: Wellington, on bark of Dacrydium cupressinum.
Endemic
