Arthonia subramulosa Müll.Arg.
Lectotype: New Zealand. Sine loco (? Auckland). Charles Knight 172, 1858, BM!
Thallus dull white, shining or cobwebby, on decorticated wood, spreading in small, whitish stains 5-15 mm diam. Ascocarps sessile, 0.2-1 mm long and 0.1 mm wide, rounded or lens-shaped to stellate-irregular, black or dark brown. Ascospores 3-septate, oblong or obovate, upper cell largest.
N: ?Auckland. Known only from the type collection.
Endemic