Abrothallus bertianus De Not.
Ascomycete fungus parasite or parasymbiotic of species belonging to genera Melanelixia, Melanelia et Melanohalea.
Limited macroscopically to apothecia (in its perfect morphology) 100-180 µm in diameter and 100-150 µm high, more or less immersed in host thallus, almost flat then more or less hemispheric, brown-black to black, surface slightly rough sometimes powdered by brown spores. Ascus 8-spored, biseriate, clavate, brown-black and finely verrucose, uniseptate, 10-14 x 4,5-6 µm. Rare, probably mostly unseen. Parasite or parasymbiotic of species belonging to genera Melanelixia, Melanelia, Melanohalea.*