Assessment Notes

Justification

Amanita mumara is ectomycorrhizal with Southern Beech (Nothofagaceaea) and with Tea-Tree (Myrtaceae), is one of the relatively few Amanita species in New Zealand and is distinctive within the genus. It is known from seven records from four sites in north island. All sites are in protected areas. 

This mushroom is rarely recorded and must be considered uncommon. There is a strong possibility of multiple undetected sites. The total number of sites is unlikely to exceed 1000 but could also be less than 10. Hence, the estimation of the total population may range from 300 to 30,000 mature individuals. .We don´t not know yet the impact of potential threats of known and potential sites.

It is therefore assessed as Data Deficient.

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Taxonomic notes

The ectomycorrhizal genus Amanita is well studied in New Zealand, with relatively few, and well recorded species. Amanita mumura is a distinctive uncommon endemic species associated with Nothofagaceae and Myrtaceae.

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Geographic range

Amanita mumura is known across the North Island of New Zealand.

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Population and Trends

Amanita mumara is one of the relatively few Amanita species in New Zealand and is distinctive within the genus. The genus has been well documented and is one of the best studied groups of Agarics in New Zealand. It is known from seven records from four sites in North Island; Waitakere, Urewera, Tongariro, Tararua (1967- 2005). All sites are in protected areas. 

Over the last five years, 2,500 observers have recorded 54,000 observations of fungi in New Zealand using the iNaturalist platform. 20,000 observations have been verified by multiple experts. This mushroom has not been seen. Despite this increased level of recording, there is a strong possibility of multiple undetected sites. The total number of sites at which it could potentially occur is unlikely to exceed 1000. 

The number of mycelial genotypes per site is estimated to be three. Using the the multiplier of ten for mature individual number (Dahlberg & Mueller 2011), size of the total population is estimated to be less than 30,000 mature individuals.

Population Trend: unknown

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Habitat and Ecology

The species is ectomycorrhizal with Southern Beech (Nothofagaceaea) and with Tea-Tree (Myrtaceae).

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Threats

Populations in three of the sites (Waitakare, Tongariro, Tararua) are adjacent to popular walking tracks subject to increasing tourism with consequent impact on the immediate areas. The population at the Waitakare site is likely to decrease over the next 20 years as the impact of Kauri die-back on the dominant Kauri forest alters the forest structure. Areas are also likely to be disturbed as a consequence of disease management actions.

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Conservation Actions

Greater survey effort in known sites is required to assess the extent of local populations.

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Use and Trade

The species is not utilized.

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Source and Citation

Cooper, J.A. 2019. Amanita mumura. The IUCN Red List of Threatened Species 2019: e.T154224278A154224851. https://dx.doi.org/10.2305/IUCN.UK.2019-3.RLTS.T154224278A154224851.en .Downloaded on 30 January 2021

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• Country occurrence