• Proposed
  • Under Assessment
  • Preliminary Assessed
  • DDAssessed
  • Published

Hyphodontia crassispora Gresl. & Rajchenb.

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Scientific name
Hyphodontia crassispora
Gresl. & Rajchenb.
Common names
IUCN Specialist Group
Mushroom, Bracket and Puffball
Assessment status
Proposed by
Alina Greslebin
Alina Greslebin, Francisco Kuhar, Donald Pfister, Camille Truong
Sergio Pérez Gorjón
Comments etc.
Anders Dahlberg, James Westrip
Gregory Mueller

Assessment Notes

Xylodon crassisporus


This species is known from only one locality in Tierra del Fuego, Argentina, but there is much potential habitat in Chile that requires survey effort. The one known site may contain only a small number of mature individuals, but without further information about the full distribution of the species it is not possible to get an accurate estimate of the total population size. Population size and trend is uncertain, and the species is listed as Data Deficient.

Taxonomic notes

This species is characterized by its odontioid basidiome growing on decayed wood of Nothofagus betuloides and Drymis winteri. Microscopically it is characterized by two types of cystidia (capitate with resinous cap and leptocystidia) and thick walled spores.
The species was combined in the genus Xylodon as Xylodon crassisporus (Riebesehl & Langer 2017).

Why suggested for a Global Red List Assessment?

This species, as far as it is known, is a corticioid fungi with a very narrow geographical distribution. It has been recorded in only one locality in Tierra del Fuego Island, even though the island has been surveyed extensively.

B1 VU: this criterium applies because it has been recorded in only one locality in Tierra del Fuego . Forest that potentially can harbor this species (Nothofagus betuloides) occupy <5000 km2, but the actual surface of forest suitable for this species is much less since it has been recorded in very humid and pristine forests of mixed Nothofagus betuloides-Drymis winteri forets that are restricted to the southern area of the island.
B2 EN: this criterium applies because it known occupancy area is < 500 km2, and in only one locality (B2a).
A3 C VU: Human impacts in the area, especially tourism, are expected to increase in the future.

Geographic range

This species has been recorded in only one locality: Estancia Moat, Ushuaia, Tierra del Fuego, Argentina. Although extensively surveyed, this species was not found in other Nothofagus forests of Tierra del Fuego island. It has also not been found in continental pure or mixed Nothofagus forests of Argentina (Chubut and Rio Negro). However, survey work is required in Chile to see whether it may occur in humid areas of Nothofagus betuloides forest in the south.

Population and Trends

The species is known from fewer than 10 collections and has been recorded in only one locality. At this site it may be stable. The overall population trend, though, is unknown. The one known locality may contain only a tiny number of mature individuals, but in the wider area there is potentially a large amount of suitable habitat. Therefore, it is not possible to get an accurate estimate of the total population size.

Population Trend: Uncertain

Habitat and Ecology

This species has been found growing on Nothofagus betuloides and Drymis winteri in pristine coastal Nothofagus betuloides subantarctic forest.

Subantarctic Forest


Human disturbance is a threat in the extremely restricted known distributional area of this species, which is on privately owned land. In the potential additional suitable habitat for the species in the wider region, the areas are isolated and probably not facing major threats.

Tourism & recreation areasUnintentional effects: subsistence/small scale (species being assessed is not the target) [harvest]Recreational activities

Conservation Actions

The species is known from privately owned land, and protection for this specific habitat within the distributional area would be beneficial for this species.

Site/area protectionResource & habitat protection

Research needed

Research into the geographic distribution (particularly in Chile) and abundance needs to be conducted. Knowledge of factors affecting its limited distribution will be very valuable, e.g. if it has any specific habitat requirements.

Population size, distribution & trendsLife history & ecology

Use and Trade

There is no use or trade of this species.


Greslebin, A. G. y M. Rajchenberg. 2000. The genus Hyphodontia in the Patagonian Andes forests of Argentina. Mycologia 92: 1155-1165.

Known distribution - countries

Regional Population and Trends

Country Trend Redlisted