Cortinarius hildegardiae and C. mariekristinae spp. nov., two new species in the phlegmacioid clade Humolentes (sect. Calochroi s. l.)

Abstract

Cortinarius hildegardiae and C. mariekristinae are described as new to science. They are phlegmacioid species with more or less yellow pilei, yellow lamellae, and extractable, greenish yellow antraquinonic pigments. They belong to the Humolentes s. l. clade. Cortinarius hildegardiae resembles C. humolens and C. osloensis, but differs from the former in the more vivid greenish yellow pileus margin and veil remnants on bulb margin when young. It differs from its phylogenetic sister species C. osloensis by smaller spores and different habitat and distribution. Cortinarius mariekristinae occupies a sister position to C. humolens, but differs from this and the often co-occurring C. osloensis e.g. by the larger spores. Species descriptions are provided, with emphasis on micromorphological characters. Their phylogenies based on nrDNA ITS sequences are presented. taxonomy, species descriptions, European distribution, ITS phylogeny, spore morphology, 2 new taxa.