Rinodina exigua (Ach.) Gray

Rinodina exigua has a light grey thin atranorin-containing thallus with abundant apothecia and Physcia-type spores (thickened cell wall near the septum and in the apices). It grows on deciduous tree bark in open forests and on solitary trees. It prefers ridged bark of old trees, mainly oaks, in thermophilic forest communities (typically forest-steppes and open oak forests). The species also occurs in nutrient-enriched localities. In the Czech Republic, it is locally abundant in natural areas of lower elevations, e.g., Podyjí and Křivoklát regions. The lichen is only rarely found in submontane areas.

Ascomycota → Lecanoromycetes → Caliciales → Physciaceae → Rinodina