Eleven new boreal species of Inocybe with nodulose spores

Abstract

The diversity and characteristics of species within Inocybe section Inocybe Singer were investigated in Finland. As a result, 11 species are described here as new: Inocybe acutoides, I. amicta, I. boreocarelica, I. bufonia, I. ericetorum, I. kittilensis, I. lapponica, I. paludicola, I. porcorum, I. pseudoteraturgus, and I. silvae-herbaceae. Detailed macroscopic and microscopic descriptions, habitat information, and ITS sequence data are included. The new species are compared with each other and with similar species within the section, and a key is provided for the European boreal species. The types of Inocybe acuta, I. alpigenes, I. borealis, I. cicatricata, I. giacomi, I. heterochrominea, I. hinnulea, I. johannae, I. proximella, I. purpureobadia, I. putilla, I. striaepes, I. taxocystis, I. teraturgus, I. tetragonospora, and I. umbrinodisca are treated. The often poorly understood Inocybe acuta, I. borealis, I. giacomi, and I. proximella, as well as the recently described I. purpureobadia, are characterised on the basis of our own material. Inocybe borealis, I. giacomi, and I. purpureobadia are reported from the boreal zone for the first time. Inocybe borealis appears to be a remarkably variable species. Inocybe striata and I. umbrinodisca are reduced to synonyms of I. proximella, I. heterochrominea is reduced to a synonym of I. borealis, and I. tetragonospora to a synonym of I. alpigenes. In addition, Inocybe hinnulea and I. striaepes are reduced to synonyms of I. giacomi, and the previously supposed synonymy of I. johannae with I. giacomi is supported by ITS analysis.