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Abstract
A new genus Psathyloma is described based on collections of agarics from New Zealand. We describe two new species in the genus, Ps. leucocarpum and Ps. catervatim, both of which have been known and tentatively named for a long time awaiting a formal description. Morphological traits and phylogenetic analyses reveal that Psathyloma forms a strongly supported sister clade to Hebeloma, Naucoria and Hymenogaster. Morphologically Psathyloma resembles Hebeloma from which it differs mainly by producing smooth basidiospores with a germ pore. The geographical range of the genus has been demonstrated to include several regions in the southern hemisphere. A survey of published environmental sequences reveals that Psathyloma spp. were isolated from ectomycorrhizal root tips from Tasmania and Argentina, indicating an ectomycorrhizal association with southern beech.
Acknowledgments
We thank Egon Horak (Zürich) for many fruitful discussions pertaining to the taxonomy of brown-spored agarics and Duckchul Park (Landcare Research, Auckland) for sequencing a number of collections. Peter Johnston is thanked for arranging collecting permits through the New Zealand Department of Conservation. This research was supported by the grant OTKA NN106394 to TP, LGN and TÁMOP-4.2.2.B-15-0006 to TP and by the New Zealand Ministry of Business Employment and Innovation.