Byssoloma marginatum (Arnold) Sérus.

Syn.: Bacidia marginata (Arnold) Lettau, Bacidia micromma (Nyl. ex Stizenb.) Hulting, Bilimbia marginata Arnold, Tapellaria similis Kalb
Lichenised.
Substrate: bark
Altitudinal range: from the mesomediterranean belt (potential vegetation: evergreen broad-leaved forests dominated by Quercus ilex) to the montane belt (potential vegetation: deciduous forests dominated by Fagus sylvatica and closed coniferous forests with Picea abies)
Note: a humid subtropical to mild-temperate lichen, growing both on bark and on needles of conifers in warm-humid areas; extremely rare in the Alps.
Austria: Steiermark;