Arthonia knightii Zahlbr.
Type: New Zealand. Sine loco. Charles Knight, ?WELT - not seen.
Thallus uniform, smooth or powdery-furfuraceous to byssoid olivaceous. Ascocarps pseudo-lecideine, sessile, rounded-deformed, plane to subconvex, black, immarginate, 1 mm diam. Ascospores 3-7-septate colourless to brownish at maturity, end cell largest, 23 × 8 µm.
N: known only from the type collection (?Wellington).
Endemic