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  • Under Assessment
  • 3Preliminary Assessed
  • 4Assessed
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Psiloboletinus lariceti (Singer) Singer

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Scientific name
Psiloboletinus lariceti
Author
(Singer) Singer
Common names
 
IUCN Specialist Group
Mushroom, Bracket and Puffball
Kingdom
Fungi
Phylum
Basidiomycota
Class
Agaricomycetes
Order
Boletales
Family
Suillaceae
Assessment status
Under Assessment
Proposed by
Catia Canteiro
Assessors
Susana P. Cunha, Susana C. Gonçalves
Comments etc.
Catia Canteiro

Assessment Notes

Species may qualify for a threatened category with criterion A due to habitat loss, but while I have good documentation for habitat reduction for China, most of its range is in Russia. Global Forest Watch shows deforestation in the region, but only one putative host (L.olgensis) is in the Russian and Global Red Lists, the others are not in included or Least Concern. I’m not sure how up to date these evaluations are but Psiloboletinus lariceti could also be Least Concern for this reason.
I am also not sure if I should join polygons in map in Eastern Russia so I have included map that has point as well to help review it.

Justification

Psiloboletinus lariceti is a bolete with a large distribution in mountain and taiga regions in Russia, and to a lesser extent in Mongolia, and northeastern China. Its population size is projected to be above 75000 mature individuals, but a population decline due to habitat loss is likely. P. lariceti is thought to form mychorrizal associations with Larix sp., but this relationship is not well defined, and habitat reduction is difficult to establish across the whole range of this species.


Taxonomic notes

Psiloboletinus lariceti is the type species of its monotypic genus. It was originally described as Phylloporus lariceti but was later transferred due to its morphologic characteristics. More recently, Wu et al. (2020) confirmed its separation from Suillus through phylogenetic analysis, and proposed Suillus foetidus as a synonym of P. lariceti, though it is not included in Species Fungorum (2023).


Why suggested for a Global Red List Assessment?


Geographic range

Found in Siberia, Far East Russia, northern Mongolia and northeastern China (Wu et al., 2020).


Population and Trends

P. lariceti is known from more than 15 sites and has a large area of potential distribution in Asia (GBIF.org, 2023, Wu et al., 2020). Following guidelines by Dahlberg and Mueller (2011), population size is projected to be above 75000 mature individuals.
Population decline in at least part of its range is likely due to a decrease in area of habitat, i.e. Larix sp. forests, caused by overexploitation. However, since P. lariceti likely associates with different Larix species across its range, it is difficult to estimate population reduction.

Population Trend: Uncertain


Habitat and Ecology

Psiloboletinus lariceti can be found on the soil, solitary to clustered. It is thought to be ectomycorrhizal and occurs under Larix siberica, L. olgensis and L. gmelinii, and in mixed forests dominated by Larix with Betula, Pinus, Rhododendron or Populus species, in taiga and mountain habitats (Wu et al. 2020).

Boreal ForestTemperate Forest

Threats

Different Larix forests have been classified as threatened in the Red list of China’s forest ecosystems ranging from Vulnerable to Critically Endangered due to a reduction of geographic distribution in a period of 50 years (Chen et al. 2020). 
In 2011, Larix sibirica and L. gmelinii were evaluated as Least Concern by the Red List of threatened species, while L. gmelinii var olgensis, (synonym of L. olgensis) is evaluated as Near Threatened due to a decline in population due to overexploitation, noting that this reduction was expected to be more pronounced in China than in the rest of its range. It was also listed in Russia’s Red Book as decreasing in numbers. However, L. gmelinii var olgensis has a much more restricted distribution than L. gmelinii or L. sibirica, and its range in Far East Russia coincides with part of L. gmelinii’s distribution. (POWO, 2023) Therefore, a decline in L. gmelinii var olgensis could have a smaller impact in Psiloboletinus lariceti’s population size if L. gmelinii and L. sibirica remain Least Concern.

Unintentional effects: large scale (species being assessed is not the target) [harvest]

Conservation Actions

Protection of Larix sp. forests in this region is essential to prevent further declines in population size.

Site/area protectionResource & habitat protection

Research needed

Research into ectomycorrhizal relationships for this species is needed to confirm putative hosts and improve estimates of the impact of habitat loss.

Life history & ecologyThreats

Use and Trade

P. lariceti is an edible species, sometimes collected in large quantities in Russia (Wu et al., 2020).

Food - human

Bibliography

 


Country occurrence

Regional Population and Trends

Country Trend Redlisted