Chaenotheca ferruginea (Turner ex Sm.) Mig.

The most common member of the genus in the Czech Republic, specific by the grey thallus with orange patches. If the lichen is less developed and the orange pigments are missing, it may be mistaken for atypical specimens of C. trichialis, which differs in the photobiont type and in smaller ascospores.

Chaenotheca ferruginea is frequent on acidic tree bark and on wood of dead trees. The species is common in forests of various types, including managed forests, but occurs also on solitary trees in avenues and parks. It is widespread throughout the Czech Republic and Europe. The lichen is tolerant to air pollution and substrate acidification. Therefore, it survived also in areas strongly affected by acid rain.

Ascomycota → Lichinomycetes → Coniocybales → Coniocybaceae → Chaenotheca