Thelocarpella gordensis Nav.-Ros. et Cl. Roux gen. et sp. nov., a crustose lichen with endolithic thallus, is only known from the type locality, in Provence (south-east of France), on calcareous sandstone. This species is characterized by entirely immersed perithecioid ascomata, a hamathecium consisting of a typical paraphysoid network, multispored asci (more than 1000 spores in optical section), and colourless small oblong spores. The genus Thelocarpella differs from Thelocarpon by having bitunicate asci with a distinctly thicker wall. Heterogeneity of the genus Thelocarpon and the systematic position of Thelocarpella and Thelocarpon are discussed. The genus Trimmatothelopsis Zschacke is considered a synonym of Acarospora A. Massal. and Thelocarpon robustum Eitner identical with Acarospora smaragdula var. murina (Sandst.) H. Magn.Key words: lichens, Thelocarpella, Thelocarpon, taxonomy.
Lecanora vaenskaei Roux et C. Coste sp.nov. is described as a new saxicolous, calcifugous lichen species, discovered in southeastern France (Var Department). It differs from Lecanora chlorophaeodes Nyl. in its thallus, apothecia, paraphyses, spores and distribution. The classification of the new species is considered with respect to the genus Rhizoplaca, which is shown to belong to the family Lecanoraceae rather than the Parmeliaceae. Key words: lichens, Lecanoraceae, Lecanora, morphology, structure, distribution, ecology, systematics, Parmeliaceae, Rhizoplaca.
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