• Proposed
  • Under Assessment
  • VUPreliminary Assessed
  • 4Assessed
  • 5Published

Chalciporus aurantiacus (McNabb) Pegler & T.W.K. Young

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Scientific name
Chalciporus aurantiacus
(McNabb) Pegler & T.W.K. Young
Common names
IUCN Specialist Group
Mushroom, Bracket and Puffball
Assessment status
Preliminary Assessed
Preliminary Category
VU A2. B2ab(iii)
Proposed by
Jerry Cooper
Jerry Cooper
Jerry Cooper
Comments etc.
Patrick Leonard

Assessment Notes


Based on an inferred population reduction over the next 20 years; small geographic range B2 AOO 56 km2; quality of habitat decline (iii) due to invasion by exotic species.

Taxonomic notes

Chalciporus aurantiacus is an uncommon New Zealand endemic of beech forests (Nothofagaceae). It is similar to the common, introduced Chalciporis piperatus but has more persistent orange/red colours and lacks the yellow mycelium at the stipe base, which is diagnostic of C. piperatus.

Why suggested for a Global Red List Assessment?

A New Zealand endemic mushroom of beech forests under threat from invasive exotic species.

Preliminary category
Vulnerable: A2. B2ab(iii). Based on an inferred population reduction over the next 20 years; small geographic range B2 AOO 56 km2; quality of habitat decline (iii) due to invasion by exotic species

Geographic range

Population and Trends

Known from 18 records from 10 localities. Extent of Occurrence 126,000 km2 Area of Occupancy 56 km2. There are only 2 confirmed sightings since 2013 coinciding with an increase in sightings of C. piperatus (52 in the same period). The continued spread of C. piperatus into the natural habitat of C. aurantiacus is likely to continue to impact on populations.

Population Trend: Decreasing

Habitat and Ecology

Chalciporus aurantiacus is only known from beech forests (Nothofagacaeae). Its mode of nutrition is unknown. The majority of boletes are ectomycorrhizal but it is likely the Chalicporoidea are parasites of other fungi. The related C. piperatus is thought to be a parasite on the mycelium of the ectomycorrhizal Amanita muscaria.

Temperate Forest


The most significant threat to C. aurantiacus is displacement by the exotic C. piperatus and its exotic host species Amanita muscaria. These latter two species have long been present in New Zealand as exotic introductions associated with introduced trees, especially in plantation forestry. From the 1960s Amanita muscaria and Chalciporus piperatus started spreading in native forests, first in South Island and later in North Island. In some areas they are now the dominant ectomycorrhizal species and their range continues to expand. They are now present in all the recorded locations of C. aurantiacus except one and may be reducing the area of possible habitat.

Named species

Conservation Actions

Research needed

Impact on native populations of ectomycorrhizal fungi as a consequence of invasion by exotic ectomycorrhizal fungi.

Life history & ecologyPopulation trends

Use and Trade


Known distribution - countries

Regional Population and Trends

Country Trend Redlisted