Tricky to assess based on only two records, the holotype and one other. However, if very conspicuous and well-documented, it could be assessed as DD. But we know its habitat is under threat and has been relatively well surveyed. We are aware that there are taxonomic issues relating to how close it might be to B. rawlingsii (see below) so we have also assessed both species together and that would change the preliminary assessment.to Endangered.
There have only ever been two known collections of this fungus fifty years apart. It has been actively sought at FUNNZs foray and by Boletus enthusiasts, but without result. Its habitat is fragmented, declining in extent and quality through a combination of development pressures and as a result of invasive species. We infer a population of 10 (1 mature invidual x 10) and we have allowed X 5 for yet to be discovered sites. We assess the species as critically endangered under D1 and D2.
Boletus novae-zelandiae McNabb 1968
Proposed by Pat Leonard. Known with certainty from the holotype only. AOO/EOO 4km2. Boletus novozelandiae and B. rawlingsii are very similar, according to the author, and both rarely reported.
Restricted to North Island.
This fungus was described by McNabb from a collection made in 1966. Only one collections have been made since and is unconfirmed. The habitat for this fungus is Leptospermum and related members of the Myrtaceae. The habitat is largely unprotected and declining due to land use change and invasive species. Coastal forests are also under pressure from recreation. The generation length for mycorrhizal fungi is suggested to be 50 years so the current population is possibly 1 mature individual.
Boletus novae-zelandiae is a mycorrhizal fungus associated with Leptospermum and Kunzea.
The known sites for this fungus are in Keri Keri (1966) and one near Auckland (2017). Both are under considerable urban development pressure. The Keri Keri collection site has been visited, but the precise site was not located probably due to land use change. Myrtaceous forests are fragmented and subject to land use change. The quality of the remaining habitat is reducing due to recreational pressures and invasive species.
Dahlberg A. and Mueller G.M. (2011) Applying IUCN red-listing criteria for assessing and reporting on the conservation status of fungal species. Fungal Ecology 4: 147-162.
Geospatial Conservation Assessment Tool: geocat.kew.org
Global Biodiversity Information Facility: gbif.org
Manaaki Whenau - Landcare Research databases: https://nzfungi2.landcareresearch.co.nz/
McNabb, R.F.R. (1968): The Boletaceae of New Zealand. New Zealand Journal of Botany 6(2): 137-176.