Cortinarius coalescens Kärcher & Seibt is a rare European species of the subgenus Phlegmacium, section Phlegmacioides, neglected in recent molecular studies. New primers (CortF and CortR) designed for species in the section Phlegmacioides allowed to obtain ITS rDNA sequence data from the holotype collection of C. coalescens; according to the results, this epithet has priority over C. crassorum Rob. Henry ex Rob. Henry, C. pardinus Reumaux, and C. parargutus Bidaud, Moënne-Locc. & Reumaux. Morphological and ecological observations on recent collections of C. coalescens from the Czech Republic in comparison with the co-occurring C. largus are discussed. Nomenclatural and taxonomic comments on C. tomentosus Rob. Henry, C. balteatotomentosus Rob. Henry, and C. subtomentosus Reumaux are also provided. So far, C. coalescens is known with certainty from Germany, France, and the Czech Republic, where it grows in deciduous forests on acid to neutral soils. Arsenic and its compounds were determined in C. coalescens and related species of the section Phlegmacioides: C. largus, C. pseudodaulnoyae, and C. variecolor. Total arsenic concentrations were in the range 3.6-30.2 mg kg-1 (dry matter) and arsenobetaine was the major arsenic compound.

Department of Biology Terrestrial Ecology University of Copenhagen Universitetsparken 15 2100 København Ø Denmark

Department of Biosciences Plant Biology University of Helsinki P O Box 65 00014 Helsinki Finland

Department of Plant Anatomy Institute of Biology Eötvös Loránd University Pázmány Péter sétány 1 c 1117 Budapest Hungary

Institute of Chemistry University of Graz Universitätsplatz 1 8010 Graz Austria

Institute of Geology v v i Czech Academy of Sciences Rozvojová 269 16500 Prague 6 Czech Republic

Institute of Microbiology v v i Czech Academy of Sciences Vídeňská 1083 Prague 4 Czech Republic

Nuclear Physics Institute v v i Czech Academy of Sciences Hlavní 130 25068 Husinec Řež Czech Republic

Ringstraße 30 61479 Glashütten Schlossborn Germany

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