Cliostomum piceicola, a new lichen species from oldgrowth coniferous forests in northern Europe

Cliostomum piceicola is described as new to science from old boreal forests in Scandinavia and Russia. It differs from C. corrugatum by the dull and finely warty surface of the thallus, in producing an unidentified, diagnostic lichen substance, by the northern distribution, and the preference for Picea abies in moist, often swampy forest.