This species is currently known from three specific localities, but the area of suitable habitat where it may occur is very large. However, the population size of the species is likely to be very small, as it is reported to be very rare. The overall population size is estimated to be c.600 mature individuals. Therefore, this species is listed as Vulnerable.
This hypogeous ectomycorrhizal species is strictly associated with Nothofagus and is only known from two localities in Chile and Argentina.
So far this species is only known from three localities in Argentina (Nahuel Huapi National Park) and Chile (Puyehue National Park and Neltume, P. Sandoval pers. comm.). The potential area that this species occupies within this area is up to 50,000 km2, but it could also occur in central Patagonia too.
The species was was repeatedly found during surveys in 2015 and 2016 at the Argentinian locality in Nahuel Huapi National Park, while the Chilean locality in Puyehue National Park was discovered in 2017, and the locality in Neltume was discovered in 2018. Between one and five ramets have been found at each site, but the species may occur over 50,000 km2 in the region around these three sites. Survey work in southern Patagonia (Magallanes and Tierra del Fuego) has failed to find this species, so it is probably not present in this area.
At first glance, the basidiome of Amanita nouhrae is similar to an immature button of an epigeous Amanita, thus it may be easily overlooked. However, this species fruits much less abundantly than other sequestrate ectomycorrhizal species associated with Nothofagus, and it is possible that this is a rare species. Taking this information into account, but conservatively using a scaling factor that assumes that it may occur into central Patagonia, the population size is estimated to be very small (c. 600 mature individuals).
Population Trend: Uncertain
This ectomycorrhizal species associates exclusively with Nothofagus species in Patagonia. So far it has been found in association with Nothofagus antarctica (Nahuel Huapi National Park in Argentina), Nothofagus dombeyi (Puyehue National Park in Chile) and Nothofagus alpina (Neltume in Chile).
This species is associated with an increasingly threatened Nothofagus forest. Deforestation, forest fires (intentional and accidental due to drought and climate change) and volcanic activity in the area are a growing threat.
Two of the known localities of Amanita nouhrae are within protected areas (national parks), one in both Chile and Argentina.
Little is known about the biology of the species (dispersal vector, fruiting patterns) as well as its ecology (habitat requirement, host specificity) and how it interacts with its Nothofagus host. Further research is needed to find out whether the species is overlooked or truly rare.
No uses or trade are known so far.
Truong, C., Sánchez-Ramírez, S., Kuhar, F., Kaplan, Z., & Smith, M. E. (2017). The Gondwanan connection – Southern temperate Amanita lineages and the description of the first sequestrate species from the Americas. Fungal Biology, 121, 638–651. https://doi.org/https://doi.org/10.1016/j.funbio.2017.04.006