Abstract
AbstractUmbilicaria orientalisDavydov sp. nov. is described and phylogenetic analysis (ITS, mtLSU andRPB2) confirmed its distinctness and indicated a sister relationship withU. trabeculatawithin theU.velleagroup. The species is morphologically similar toU. velleabut differs by simple, cylindrical or strap-like rhizinomorphs and by thalloconidia, developing both on the lower surface and on rhizinomorphs, that are 1–2 (rarely 4)–celled or in aggregates of up to 5–6 cells.Umbilicaria orientalisis described from the Russian Far East and is currently known from a wide range of localities in East Asia, from the Far East to South Siberia and Mongolia in the north, to Hebei and Tibet in the south. New sequences ofU. americanawere obtained; the species represents an independent phylogenetic lineage withinUmbilicariasubg.Papillophora. Diagnostic traits and variability of different developmental stages ofU. orientalis, as well as its East Asian distribution pattern, are discussed.
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