New Cortinarius (Agaricales) species described from New Zealand

As part of an ongoing effort to investigate the diversity of the genus Cortinarius in New Zealand, 12 new species are described: Cortinarius caryotoides, Cortinarius citribasalis, Cortinarius durifoliorum, Cortinarius eucollybianus, Cortinarius eunomalus, Cortinarius juglandaceus, Cortinarius lanceolatus, Cortinarius minilacus, Cortinarius peraurilis, Cortinarius pseliocaulis, Cortinarius rubrimarginatus and Cortinarius salmastrium. Moreover, the diversity of Cortinarius section Limonii and subgenus Callistei are reviewed in the light of recent findings in the South Pacific, and a key is provided. It is shown that both infrageneric taxa are bihemispherical, whereas the core population of the former is actually located in New Zealand. A phylogram, covering the taxa discussed, is presented to illustrate their genetic relations.