We studied the taxonomy of Pluteus romellii, and morphologically similar Holarctic species in the /romellii clade of section Celluloderma, using morphological and molecular data (nrITS, TEF1-α). Pluteus romellii is lectotypified and epitypified and accepted as an exclusively Eurasian species. Pluteus lutescens and P. pallescens are considered synonyms of P. romellii. Pluteus fulvibadius is accepted as a related, but separate, North American species. Five species in the /romellii clade are described as new to science: two from North America (P. austrofulvus and P. parvisporus), one from Asia (P. parvicarpus), one from Europe (P. siccus), and one widely distributed across the Holarctic region (P. vellingae). Basidioma size, pileus color, lamellae color, basidiospore size, hymenial cystidia shape and size, habitat and geographical distribution help separate the species described here, but in some instances only molecular data allows for confident identification. The current status of P. californicus, P. melleipes, P. romellii var. luteoalbus, P. splendidus, P. sternbergii and P.sulphureus is discussed.

Andrew Minnis USDA APHIS PPQ Seattle Plant Inspection Station 835 S 192nd St Suite 1600 SeaTac WA 98148 USA

Associazione Micologica Bassa Friulana via Vespucci 7 33052 Cervignano del Friuli Italy

Centre of the Region Haná for Biotechnological and Agricultural Research Crop Research Institute Šlechtitelů 29 78371 Olomouc Czech Republic

Department of Botany Moravian Museum Zelný trh 6 659 37 Brno Czech Republic

Department of Ecology and Evolutionary Biology University of Tennessee Knoxville TN 37996 USA

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

Department of Plant and Animal Production Atabey Vocational School Isparta University of Applied Sciences Isparta 32670 Turkey

Guillermo Muñoz González C Tudela 20 50650 Gallur Spain

New Brunswick Museum 277 Douglas Ave Saint John NB E2K 1E5 Canada

Renée Lebeuf 775 Rapide Nord Saint Casimir QC G0A 3L0 Canada

Schlossfeld 17 AT 6020 Innsbruck Austria

Shatelena Str 20 75 194021 St Petersburg Russia

The Hoosier Mushroom Society 3912 S Carey St Marion IN 46953 USA

Via Quargnento 17 15029 Solero Italy

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