Pertusaria theochroa Kremp.
Holotype: New Zealand. Sine loco (prob. Wellington). Charles Knight, M 123-80/12!
Thallus pale yellowish to grey-white with fertile verrucae yellowish and remainder of thallus thin, greyish indistinct. Fertile verrucae scattered 0.1-0.3 mm diam., ± hemispherical to conical, flattened, waxy at apex. Apothecia immersed 1-3 per verruca, ostioles minute, blackened, disc black, innate. Asci 8-spored. Ascospores biseriate, broadly ellipsoid to oval, contents oily-granular 87-113 × 35-40 µm, wall thickened at apices, 6-17 µm thick. Chemistry: Unidentified compound (?xanthone) charring UV+ citrine yellow.
N: Known only from the type collection.
Endemic
A characteristic species on lignum, probably more widely distributed on this substrate.
It is possible that P. leucodeoides Müll. Arg. is referable to this species since chemical and spore characters are the same.
