Checklist of fungi on Nothofagus species in New Zealand.
An annotated list is presented of 906 fungal taxa which have been recorded in New Zealand in close association with the five endemic taxa of Nothofagus, as ectomycorrhizal mycosymbionts, pathogens or saprobes causing decay of wood and leaves. The list was compiled from data associated with herbarium specimens and from the literature. Information included with each fungal taxa includes effects/symptoms, species names, incidence and habitats. Nothofagus forests are an important conservation resource for fungi; 35% of known agaric mycota are associated with Nothofagus, and 50% of polypore species. Of the 226 species of ectomycorrhiza found, about 90% are native, with almost all being endemic. Six mycorrhizal agaric genera are especially well represented; Amanita (11 species), Cortinarius (57), Dermocybe (11), Inocybe (13), Russula (23) and Thaxterogaster (13). Two mitosporic fungi, Nodulisporium sp. and Sporothrix sp., in association with some insect species, could be partially responsible for beech forest decline. Large numbers of saprobic fungi were recorded on beech wood or twigs and leaf litter, and some of these cause economically significant wood rots and sapstain.