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

Pseudoaustroboletus valens (Corner) Yan C. Li & Zhu L. Yang

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Scientific name
Pseudoaustroboletus valens
(Corner) Yan C. Li & Zhu L. Yang
Common names
IUCN Specialist Group
Mushroom, Bracket and Puffball
Assessment status
Under Assessment
Proposed by
Catia Canteiro
Susana P. Cunha, Susana C. Gonçalves
Comments etc.
Catia Canteiro

Assessment Notes

I’m not sure if I should join polygons in SE Asia in distribution map.

Seems to be relatively known in Japan - searching with its common name rather than scientific shows a lot more photos and comments in blogs and forums about the species.


Pseudoaustroboletus valens is a bolete found in East Asia, Southeast Asia, and the United States of America, with a projected population size of around 43000 individuals. Deforestation in Southeast Asia is likely leading to a decline in population in part of its range, but since the species is not exclusive to this region and given the large number of potential plant hosts, P. valens is assessed as Least Concern (LC).

Taxonomic notes

Pseudoaustroboletus valens is the only species in its monotypic genus, created based on morphological and molecular data for this species. Synonyms: Tylopilus valens, Boletus albellus, Boletus valens. (Li et al., 2014)

Why suggested for a Global Red List Assessment?

Geographic range

P. valens is known from East Asia and Southeast Asia, specifically China, Japan, Indonesia, Malaysia (both Peninsular Malaysia and Borneo), Singapore and Vietnam. The species has also been found in the United States of America and though the most recent confirmed record was in 1947 (GBIF.org, 2023), a more recent observation in Mushroom Observer in 2001(https://mushroomobserver.org/110331) could indicate that this species is still present in this region.

Population and Trends

P. valens has a wide distribution, especially in East and Southeast Asia. It has been recorded in approximately 43 sites in total, in Japan (27), China (5), Malaysia (4), USA (3), Singapore (2), Indonesia (1) and Vietnam (1) (GBIF.org, 2023, Pham, and Morozova, 2020 and Li et al., 2014). Population size is estimated at 43000 mature individuals, using the guidelines in Dahlberg and Mueller (2011). However, observations made in Indonesia, Singapore and the USA are more than 50 years old. Given that its fruitbodies are not inconspicuous, this could indicate that the species is not common, in at least part of its range.
Deforestation in Southeast Asia may be causing a decline in population size for this species. However, total population reduction is difficult to estimate given that P. valens is not exclusive to this region and has a large potential area of suitable habitat.

Population Trend: Decreasing

Habitat and Ecology

P. valens is a terrestrial fungus, found in forests dominated by Fagaceae (Li et al. 2014).

Temperate Forest


The extensive deforestation in Southeast Asia (Global Forest Watch, 2023) may present a threat to this species and cause a decline in population in part of its range.

Agro-industry farmingAgro-industry plantations

Conservation Actions

Though the species is not considered threatened, habitat protection in Southeast Asia is recommended to prevent further population declines in this region.

Site/area protectionResource & habitat protection

Research needed

Use and Trade


Country occurrence

Regional Population and Trends

Country Trend Redlisted