A fresh outlook on the smooth-spored species of Inocybe: type studies and 18 new species

On the basis of detailed morphological and molecular investigation, eighteen new species of Inocybe ( I. alberichiana , I. beatifica , I. bellidiana , I. clandestina , I. drenthensis , I. dryadiana , I. gaiana , I. ghibliana , I. grusiana , I. knautiana , I. lampetiana , I. oetziana , I. orionis , I. plurabellae , I. rivierana , I. scolopacis , I. sitibunda and I. tiburtina ) are described. All of them are smooth-spored, and most of them are pruinose only in the apical part of the stipe. The new species are compared to 40 type specimens, all of which are described here and for several of which (partial) ITS sequences have been generated. For eight species, epi-, lecto- or neotypes were selected, among these are I. geophylla, I. glabripes and I. tigrina . Based on these studies, we suggest twelve synonymies, i.e. that I. clarkii is synonymous with I. sindonia , I. conformata with I. cincinnata , I. elegans with I. griseolilacina , I. fuscidula with I. glabripes , I. griseotarda with I. psammobrunnea , I. obscurella with I. obscuroide s, I. obscuromellea with I. semifulva , I. patibilis and I. tigrinella with I. tigrina , I. petroselinolens with I. tenuicystidiata and I. rubidofracta with I. pseudorubens and I. subporospora is synonymized with I. tjallingiorum . All of the new species are supported by phylogenetic analyses. Among the previously described species accepted here, sixteen are represented by types in the phylogenetic analyses and ten by own collections morphologically corresponding to the type. In summary, we here verify or provide morphological concepts associated with molecular data for 44 smooth-spored species of Inocybe .