A highly specialised saxicolous lichen that colonises exposed hard siliceous rocks. It typically grows on smooth rock superficies, for example, on lydite. Often, it also occurs on extrusive igneous rocks. Such extreme habitats are usually poor in other lichens. There are only few species with similar ecology, e.g. another rare species Pleopsidium flavum. In general, Dimelaena oreina occurs from lowlands to mountains. In the Czech Republic, it prefers dry xerothermic areas. Most of its localities are concentrated in Prague surroundings, in the České středohoří Hills and in valleys of some South Moravian rivers.
Literature: Suza J. (1942): Česká xerothermní oblast a lišejníky. – Věstník Královské české společnosti nauk 1941/18: 1–38. Suza J. (1947): Praebohemikum a lišejníky. – Věstník Královské české společnosti nauk 1946/1: 1–34.taxonomic classification:
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