Cortinarius subgenus Leprocybe (Agaricales) in New Zealand

Cortinarius is the largest genus of Agaricales (mushrooms) in the world with a cosmopolitan distribution. All species are ectomycorrhizal. Cortinariaceae is a very diverse fungal family, recently split into ten genera, one of which is Cortinarius. The former genus Cortinarius s. lato, in its turn, was traditionally divided into 4–7 subgenera, of which one of the later additions is the subgenus Leprocybe. Here we review the diversity of Leprocybe in the Southern Hemisphere. Using a 4-locus molecular phylogeny, it is shown that all but one of M. Moser’s original sections are represented in the South Pacific region, many of them in New Zealand. Several species sharing a morphology that may be designated ‘leprocyboid’ are found in the country. These are discussed, their taxonomy is analysed, and a key is provided. Three new species (Aureonarius ruficollybianus, Cortinarius stenophryx, and Cystinarius pseudoeutactus) are proposed. The leprocyboid Cortinarius sect. Incensi, present in New Zealand, appears not to nest in any of the studied genera, but an analysis with more genes and a wider taxon sampling is required to clarify its position within the phylogeny of the family.