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

Dendrothele pitrae Gresl. & Rajchenb.

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Scientific name
Dendrothele pitrae
Gresl. & Rajchenb.
Common names
IUCN Specialist Group
Mushroom, Bracket and Puffball
Assessment status
Proposed by
Alina Greslebin
Comments etc.
Alina Greslebin

Assessment Notes

Taxonomic notes

The species is characterized by the crustaceous white corticioid basidiome, growing almost specifically on bark of living Myrceugenia exsucca. Microscopically it is characterized by the encrusted dendrophyses and cylindric and smooth basidiospores with a median characteristic constriction. (Greslebin & Rajchenberg 1998).

Why suggested for a Global Red List Assessment?

Dendrothele pitrae is a rare corticioid fungi living on bark of living trees only known from the temperate zone of Argentina.
It is almost confined to Myrceugenia exsucca which is restricted in distribution to Argentina and Chile.
Dendrothele pitrae has not been found in surveys in neighboring Chilean forests (Gorjón & Hallenberg 2012).
Host presents a decreasing population trend frequently altered by the action of man and by the construction of recreational areas.
The ongoing decline of its host tree of in combination with its fragmentation and rareness, considering undiscovered sites, results in it being assessed as Vulnerable (VU) under the criteria:

B2ab(iii) VU: this criterium applies because area of occupancy estimated to be less than 2,000 km2.
D1 VU: this criterium applies on the basis of an inferred population with less than 1000 individuals + low number of locations

Geographic range

Known from few localities:
Argentina, Chubut, Lago Puelo (SPG 2789); Chubut, Cushamen, Epuyen (AG 1084, holotype); Neuquén, Nahuel Huapi National Park, Puerto Blest (SPG 2906); Río Negro, El Bolsón (MR 11220).
It has been searched for but not found in Chile (Gorjón & Hallenberg 2012).
It has been occasionally recorded in Tierra del Fuego (Estancia Moat, Depto. Ushuaia, Argentina), growing on Berberis ilicifolia and Maytenus magellanica.

Population and Trends

The species is known from less than 10 specimens.
Population Trend: Presumably decreasing since the host tree presents a decreasing population trend.

Population Trend: Decreasing

Habitat and Ecology

Growing on bark of Myrceugenia exsucca, rarely found on Berberis ilicifolia and Maytenus magellanica.
Subantarctic Forest

Temperate Forest


The host, Myrceugenia exsucca is a very hydrophilic species, next to rivers, lakes, estuaries, especially in temporarily flooded lands, in sites frequently altered by the action of man and by the construction of recreational areas, campsites, jetty areas, so it presents some degrees of vulnerability and threat.

Tourism & recreation areasUnintentional effects (species being assessed is not the target)Recreational activitiesIncrease in fire frequency/intensityDroughts

Conservation Actions

Hosts protection.
Resource & habitat protection

Resource & habitat protection

Research needed

Geographic presence needs to be assessed, especially in Chile.
Knowledge on factors affecting its limited distribution within the host range are highly desirable.
Taxonomy, Population size, distribution & trends

Population size, distribution & trends

Use and Trade


Gorjón S.P., Hallenberg N. 2012. Some new species and a first checklist of corticioid fungi (Basidiomycota) from Chile. Mycol. Progress 12:185-192.

Known distribution - countries

Regional Population and Trends

Country Trend Redlisted