title: Entoloma subgenus Leptonia in boreal-temperate Eurasia: towards a phylogenetic species concept.
abstract: This study reveals the concordance, or lack thereof, between morphological and phylogenetic species concepts within Entoloma subg. Leptonia in boreal-temperate Eurasia, combining a critical morphological examination with a multigene phylogeny based on nrITS, nrLSU and mtSSU sequences. A total of 16 taxa was investigated. Emended concepts of subg. Leptonia and sect. Leptonia as well as the new sect. Dichroi are presented. Two species (Entoloma percoelestinum and E. sublaevisporum) and one variety (E. tjallingiorum var. laricinum) are described as new to science. On the basis of the morphological and phylogenetical evidence E. alnetorum is reduced to a variety of E. tjallingiorum, and E. venustum is considered a variety of E. callichroum. Accordingly, the new combinations E. tjallingiorum var. alnetorum and E. callichroum var. venustum are proposed. Entoloma lepidissimum var. pauciangulatum is now treated as a synonym of E. chytrophilum. Neotypes for E. dichroum, E. euchroum and E. lampropus are designated.
authors.affiliation: Komarov Botanical Institute, 197376, 2 Prof. Popov Str., St Petersburg, Russia;
authors.forename: O V
authors.initials: OV
authors.lastname: Morozova
authors.affiliation: Naturalis Biodiversity Center, section Botany, P.O. Box 9517, 2300 RA Leiden, The Netherlands.
authors.forename: M E
authors.initials: ME
authors.lastname: Noordeloos
authors.affiliation: P.O. Box 30041, 08034 Barcelona, Spain; e-mail: vilamicol@telefonica.net .
authors.forename: J
authors.initials: J
authors.lastname: Vila
keywords: Entolomataceae; morphology; multiple gene phylogeny; neotypes; new species