Buellia erubescens Arnold

This species is morphologically very similar to the more common B. disciformis but differs in the tiny, uniformly pigmented spores, the hymenium without oil droplets, and the content of norstictic acid in the thallus. Alike B. disciformis, it prefers smooth, nutrient-rich bark of deciduous wooden plants in older scree forests and beechwoods. Out of the Czech Republic, it has been reported also from wood. In Europe, the lichen is widespread but mostly rare. In the Czech Republic, it has been found only on beech in the submountain areas of Bohemia – in the Žofínský prales forest reserve and its surroundings in the Novohradské hory Mts and in a few localities in the Šumava Mts. Interesting was its occurrence on Aesculus hippocastanum in the Průhonice park near Prague reported by Mirko Svrček in 1955, the finding, however, has not been revised.

Ascomycota → Lecanoromycetes → Caliciales → Caliciaceae → Buellia