Halecania viridescens Coppins & P. James

An inconspicuous, usually sterile, sorediate, epiphytic lichen, growing on deciduous wooden plants both in forests and a managed landscape (in field draws, orchards, parks). As a basically pioneer and slightly nitrophilous species, it prefers smooth bark on inclined or horizontal parts of young tree trunks and upper parts of branches of any diameter. However, it may be found also on thicker trunks and furrowed bark (e.g. on Salix fragilis). Halecania viridescens occurs both on sun-exposed and partly shaded habitats. It prefers slightly nitrophilous communities. We may often find it in an association with Catillaria nigroclavata and Candelariella efflorescens agg. The species is often overlooked and its distribution is expected to be much larger. We suspect it is a relatively common lichen in the Czech Republic.

Ascomycota → Lecanoromycetes → Leprocaulales → Leprocaulaceae → Halecania