STUDIEN ÜBER EINIGE ARTEN DER FLECHTENGATTUNG XANTHORIA MIT ISIDIIFORMEN VEGETATIVEN DIASPOREN

Abstract

  This is a revision of some species of Xanthoria with isidia-like propagules, mainly from Mediterranean Europe. The following new taxa are described: X. elegans v. granulifera from Greenland and Spitzbergen, X. mediterranea from the central and southern Mediterranean region, and X. stiligera from the southern Mediterranean region, North Africa and southwestern Asia. X. papillifera is reported from the Karakorum. X. mediterranea should be closely related to X. parietina, whereas the affinities of X. stiligera are still not clear. The name “isidioidea”, which was frequently used for several species treated in this paper, especially for X. mediterranea and X. stiligera, is not applied here because the type material has been apparently lost; in any case, X. isidioidea does not belong to either species. Morphology, ecology and distribution of each species are briefly discussed, and a key for identification is provided.