• Proposed
  • Under Assessment
  • 3Preliminary Assessed
  • 4Assessed
  • 5Published

Rhizopogon togasawarensis Mujic, K. Hosaka & Spatafora

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Scientific name
Rhizopogon togasawarensis
Mujic, K. Hosaka & Spatafora
Common names
IUCN Specialist Group
Mushroom, Bracket and Puffball
Assessment status
Under Assessment
Proposed by
Masao Murata
Masao Murata
Comments etc.
Anders Dahlberg

Assessment Notes

Taxonomic notes

Why suggested for a Global Red List Assessment?

This species is the ectomycorrhizal fungus that lives only in symbiosis with the critically endangered Japanese Douglas-fir (Pseudotsuga japonica). Therefore, I think that this species should also be included in the Red List.

Geographic range

This species is found only in the Japanese Douglas-fir stands. Japanese Douglas-fir is only present on east Kochi prefecture and the Kii peninsula in Japan.

Population and Trends

This species is only sympatric with Pseudotsuga japonica, so the population size is also dependent on the tree. The host population is approximately 2000 individuals and is decreasing. Furthermore, since not all hosts and this species are symbiotic, it is estimated that the population size of this species is even smaller than the host.

Population Trend: Decreasing

Habitat and Ecology

This species is the ectomycorrhizal fungus that lives only in symbiosis with the critically endangered Japanese Douglas-fir. Therefore, the fungus is only present in forests dominated by Japanese Douglas-fir. In addition, the fungus is hypocarpogean which produces fruiting bodies in the soil and the dispersal of its spores is dependent on animals.

Temperate Forest


The threat of this species is the same as the threat of endangered Japanese Douglas-fir, as this species cannot survive without its host.

Scale Unknown/UnrecordedIntentional use: subsistence/small scale (species being assessed is the target) [harvest]

Conservation Actions

As this species has only recently been discovered, there has been no conservation action done on it. On the other hand, some areas of its habitat are protected for its host, Japanese Douglas-fir.

Site/area protection

Research needed

Life history & ecologyThreatsActions

Use and Trade



Country occurrence

Regional Population and Trends

Country Trend Redlisted