• Proposed
  • Under Assessment
  • Preliminary Assessed
  • LCAssessed
  • 5Published

Vararia incrustata Gresl. & Rajchenb.

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

Assessment Notes


This species is currently known only from Tierra del Fuego in Argentina, although survey work to find this species in Chile is yet to occur. Recent observations of this species have only come from pristine forest and so the species is suspected to be undergoing a decline. However, there is much potential habitat for the species remaining in the region, and so it is not thought to approach the thresholds for listing as threatened at the moment. It is, therefore, listed as Least Concern.

Taxonomic notes

This particular species is unique in the genus because of its encrusted, poorly branched subhymenial dichophyses with blunt apices.

Why suggested for a Global Red List Assessment?

This species has a narrow geographic distribution, restricted to Tierra del Fuego Island. The population could be decreasing.

B1 VU: this criterium applies because it has been recorded only in Tierra del Fuego. Forest that potentially can harbor this species (Nothofagus betuloides and N. pumilio forets) occupy, at most, 5000 km2, but the actual surface of forest suitable for this species is much less since it has been recorded mostly in humid, pristine forests.
A3 C: The main anthropogenic impacts in forest of Tierra del fuego (forestry and tourisms) have been steadily increasing since the beginning of the twentieth century and are expected to continue increasing.

Geographic range

This species is known only from Tierra del Fuego, Argentina, in various localities in Ushuaia department: Ea. Moat; El Martial glacier; Lago Escondido; the road to Termas; Monte Olivia; Ea. El Valdez; and in the Parque Nacional Tierra del Fuego (in the area of Bahía Lapataia, Ensenada and Río Pipo).

It has not been found on the continent in Argentina even in the well researched mixed Nothofagus forests of Chubut and Rio Negro. Searches are yet to occur in Chile (e.g. searches in Magallanes would be beneficial).

Population and Trends

In a survey conducted 1996-1999 the species was recorded 14 times. However, in a recent study of fungal diversity in managed and unmanaged forests conducted in 2012-2013 it was recorded only once in pristine forests. It is suspected that the species is declining and this may continue into the future.

Population Trend: Decreasing

Habitat and Ecology

It is found growing on Nothofagus betuloides, Nothofagus pumilio and, occasionally, on Drymis winteri. Mostly it is found on much decayed bark but also on wood.

Subantarctic Forest


Anthropogenic disturbance (forestry, tourism and recreational use) impacts this species’ habitat, which can lead to habitat fragmentation.

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

Conservation Actions

Some subpopulations are found in the Parque Nacional Tierra del Fuego. Resource and habitat protection may be important for this species.

Resource & habitat protection

Research needed

The geographic distribution of this species and its abundance needs to be assessed, particularly searching for the species in Chile. Monitoring of the area would be important to help to analyse the rate of decline into the future. Knowledge of factors affecting its limited distribution within the host’s range (why it is not present in continental forests in Argentina) will also be very valuable, as would research into how forest management may impact this species, as this species appears to only be found in pristine sites. Finally, this species is unique in its genus because of micromorphological features. It will be interesting to study it phylogenetic affinities in order to assess its particular value from an evolutionary and taxonomic point of view.

TaxonomyPopulation size, distribution & trendsLife history & ecologyThreatsPopulation trendsHabitat trends

Use and Trade

There is no use or trade of this species.


Known distribution - countries

Regional Population and Trends

Country Trend Redlisted