Assessment Notes

Justification

Cantharellus eyssartieri is endemic to Madagascar, having only been recorded from the vicinity of Ranomafana National Park. It is a rare species, and could have a population size as small as 200-500 mature individuals. This would place the species at the Endangered-Vulnerable borderline under criterion D. Ongoing anthropogenic activities such as agriculture and logging are likely to be having an impact on the species outside of the National Park, but the protected area may be providing a degree of protection to individuals that are strongly suspected to occur there. Therefore the overall population trend is uncertain. If it were to be shown to be in decline it could even qualify as Critically Endangered under criterion C. Taking into account these uncertainties, a precautionary approach is taken using criterion D, and the species is assessed as Endangered.

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Geographic range

This species has only been recorded from near Ranomafana National Park in eastern Madagascar (see Buyck and Randrianjohany 2013).

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Population and Trends

This is a rare species (Buyck et al. 2015). The description of this species only refers to two collections, and each of these may represent one functional individual (see Dahlberg and Mueller 2011). As the species is considered to be rare, using a multiplier of 10 to translate from functional individuals to mature individuals may be inappropriate, instead a range is suggested of 2 - 5. This would then convert to only 4-10 known mature individuals. Scaling up to take into account additional, unrecorded sites could mean a further scaling up of c.50x. This would give an overall population size of 200-500 mature individuals.

The species has only been recorded from outside of Ranomafana National Park, and so these sites could be threatened by ongoing anthropogenic activities. However, it is strongly suspected that the species also occurs inside the park, where it will be afforded a degree of protection. It is uncertain, therefore, what the overall population trend may be.

Population Trend: Unknown

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Habitat and Ecology

This species has been recorded from the leaf litter of Uapaca ferruginea forest (Buyck and Randrianjohany 2013).

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Threats

This species has been reported from a site bordering Ranomafana National Park, so it may be afforded some degree of protection by this. However, sites outside of the protected area are likely to be being impacted by anthropogenic activities such as clearance for agriculture and logging.

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Conservation Actions

Ensuring continued protection for Ranomafana National Park is important, although the species has not been confirmed from within the boundaries of the Park as of yet. Surveys should be conducted to confirm that this species does occur within Ranomafana National Park.

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Source and Citation

Westrip, J.R.S. 2025. Cantharellus eyssartieri. The IUCN Red List of Threatened Species 2025: e.T189960274A271994146. Accessed on 23 November 2025.

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• Country occurrence