• Proposed
  • 2Under Assessment
  • 3Preliminary Assessed
  • 4Assessed
  • 5Published

Geomorium geodon Kraisit., Pfister, Mujic, Kuhar & M.E. Sm.

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Scientific name
Geomorium geodon
Kraisit., Pfister, Mujic, Kuhar & M.E. Sm.
Common names
IUCN Specialist Group
Cup-fungi, Truffles and Allies
Incertae sedis
Assessment status
Proposed by
Camille Truong
Comments etc.
Camille Truong

Assessment Notes

Taxonomic notes

Kraisitudomsook et al. (2020) mention that this species could correspond to Underwoodia singeri var. fulvostipitata, but the type specimen of this variety is apparently lost.

Why suggested for a Global Red List Assessment?

This hypogeous ectomycorrhizal species is strictly associated with Nothofagus and is only known from three localities in Chile and Argentina.

Geographic range

This species occurs in Nothofagus forests of Chile (Magallanes Nacional Reserve) and Argentina (Nahuel Huapi National Park).

Population and Trends

So far this species is only known from three localities in Nothofagus forests of Chile (Magallanes Nacional Reserve) and Argentina (Nahuel Huapi National Park). The wide geographic distance between these localities may indicate that the species is overlooked. Geomorium geodon is easily confused with the more common species Geomorium singeri, but these assumption may be the result of the timing of sampling and the locations visited (Kraisitudomsook et al. 2020).

Population Trend: Uncertain

Habitat and Ecology

This ectomycorrhizal species associates exclusively with Nothofagus species in Patagonia. So far it has been found in association with Nothofagus pumilio (Magallanes Forest Reserve in Chile) and Nothofagus dombeyi (Nahuel Huapi National Park in Argentina).

Subantarctic Forest


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 Northern part of its distribution range are a growing threat.

Increase in fire frequency/intensityVolcanoesHabitat shifting & alteration

Conservation Actions

The three known localities of Geomorium geodon are within protected areas (national park or national reserve) in both Chile and Argentina.

Site/area protection

Research needed

Little is known about the biology of the species (fruiting patterns) as well as its ecology (habitat requirement, host specificity) and functions for his Nothofagus host. Its current distribution and population number needs further research to find out whether the species is overlooked or the populations truly fragmented.

Population size, distribution & trendsLife history & ecology

Use and Trade

No use or trade are known so far.


Kraisitudomsook, N., Healy, R. A., Pfister, D. H., Truong, C., & Nouhra, E. (2020). Resurrecting the genus Geomorium : Systematic study of fungi in the genera Underwoodia and Gymnohydnotrya ( Pezizales ) with the description of three new South American species. Persoonia 44, 98–112.

Known distribution - countries

Regional Population and Trends

Country Trend Redlisted