Assessment Notes

Justification

Heliogaster columellifer is a sequestrate fungus endemic to Japan, where it has a wide distribution. It has been found in association with various plant species and is expected to have a large area of suitable habitat. Its population size is estimated as more than 210,000 mature individuals, and there is no evidence of a population decline. Therefore, the species is assessed as Least Concern (LC).

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Taxonomic notes

Heliogaster columellifer was originally described as Octaviania columellifera but was later transferred to a new monotypic genus based on morphologic and phylogenetic evidence. Japanese Octaviania asterosperma are considered a misidentification of H. columellifer. (Orihara et al. 2010).

Orihara et al. (2010) also consider Arcangeliella mitsueae to be a synonym of H. columellifer, but it is not included in Species Fungorum (2023).

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Geographic range

This species is considered endemic to Japan (Orihara et al. 2010).

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Population and Trends

Heliogaster columellifer has been documented in more than 44 sites across Japan (GBIF.org 2023) and in association with varied tree species. Following the guidelines of Dahlberg and Mueller (2011), population size is projected to be above 210,000 (42 sites x 10 mature individuals per site x 500 multiplier for potential additional sites), taking into account its likely large area of suitable habitat and inconspicuousness of the fruiting bodies. There is no evidence of population decline.

Population Trend: Unknown

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Habitat and Ecology

Heliogaster columellifer is an ectomycorrhizal, hypogeous to subepigeous sequestrate species. It is mainly found under Abies firma, but also under Cedrus deodara, Quercus serrata, Castanopsis sieboldii, Abies veitchii, Pinus densiflora and P. thunbergia. (Orihara et al. 2010).

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Threats

No major threats have been identified for this species. The plant species that H. columellifer grows in association with have also been assessed as Least Concern in the IUCN Red List of Threatened Species, though a decline due to the reduction in forested areas near cities was reported for Abies firma (Katsuki et al. 2013)

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Conservation Actions

No major conservation actions are needed. Octaviania columellifera was listed in Japan's National Red List (Ministry of the Environment 1997-2000) in Threatened Category I (CR+EN). However, Kanto was the only region listed in its distribution at the time, which may have triggered its threatened category, and the species has not been listed in subsequent Red Lists.

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Source and Citation

Cunha, S.P. & Gonçalves, S.C. 2025. Heliogaster columellifer. The IUCN Red List of Threatened Species 2025: e.T265999494A266018613. Accessed on 23 November 2025.

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• Country occurrence