• Proposed
  • Under Assessment
  • Preliminary Assessed
  • LCAssessed
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Squamanita pearsonii Bas

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Scientific name
Squamanita pearsonii
Author
Bas
Common names
Strathy Strangler
IUCN Specialist Group
Mushroom, Bracket and Puffball
Kingdom
Fungi
Phylum
Basidiomycota
Class
Agaricomycetes
Order
Agaricales
Family
Tricholomataceae
Assessment status
Assessed
Preliminary Category
LC
Proposed by
Gareth Griffith
Assessors
Gareth Griffith
Comments etc.
Anders Dahlberg

Assessment Notes

R-L categories correct, but text here does not match final assessment. Updated version will be published in IUCN´s Red List June or Nov 2019.

Justification

Squamanita pearsonii is one of the rarer members of genus Squamanita, known from only 13 locations globally. It is a biotrophic parasitic fungus of the widespread and common saprotrophic fungus Cystoderma amianthinum.


Taxonomic notes


Why suggested for a Global Red List Assessment?

One of the rarer members of genus Squamanita. A biotrophic parasite of Cystoderma amianthinum, known from only 13 locations globally (Griffith et al., 2019). Its close relative S. paradoxa also parasitises the same host but is more commonly reports (182 records globally, 147 of these from UK and Sweden). Mycocecidia of both species comprise the basidiocarp of the parasite atop the remnants of the stipe of the host. In the case of S.paradoxa the remnant portion of the C. aminathinum stipe is usually readily apparent but this is less often the case for S. pearsonii (van Heerden et al., 2018).


Geographic range

Squamanita pearsonii is endemic to temperate habitats in the northern hemisphere.


Population and Trends

Squamanita pearsonii is globally rare, though seen in Europe with slightly more frequency than in North America. Its host Cystoderma amianthinum is widespread and common, with no evidence of decline. Relative to its close relative which attacks the same host and thus occupies the same habitats, it is much rarer. Despite increased surveying of semi-natural grasslands across Europe, it has been recorded only 10 times (vs 176 records in Europe for S. paradoxa)

Population Trend:


Habitat and Ecology

Squamanita pearsonii is a biotrophic parasite of the saprotrophic fungus Cystoderma amianthinum.  Its close relative S. paradoxa also parasitises the same host but is more commonely reports (182 records globally, 147 of these from UK and Sweden). Mycocecidia of both species comprise the basidiocarp of the parasite atop the remnants of the stipe of the host. In the case of S.paradoxa the remnant portion of the C. aminathinum stipe is usually redily apparent but this is less often the case for S. pearsonii (van Heerden et al., 2018). Found in mossy grassland and coniferous forest

Boreal ForestTemperate Grassland

Threats

Habitat loss, esp. of undisturbed grassland habitats

Shifting agriculture

Conservation Actions


Research needed


Use and Trade

The species is not known to be used.


Bibliography

Argaud, D., Wiest, R., 2018. Première récolte dans le Nord-Est de la France d’une espèce aussi spectaculaire que rarissime : Squamanita pearsonii Bas (Agaricales, Basidiomycota).  (2018) pp.38-52 Bull. Féd. Mycol. (Contribution n° 66 au Programme national d’Inventaire mycologique et de Cartographie des Mycota français) 16: 38-52.

Bas, C., 1965. The genus Squamanita. Persoonia 3: 331-359.

Griffith, G.W., Gajda, K.P., Detheridge, A.P., Douglas, B., Bingham, J., Bowmaker, V., Turner, A., Evans, D.A., McAdoo, W.G., Dentinger, B.T.M., 2019. Strangler unmasked: Parasitism of Cystoderma amianthinum by Squamanita paradoxa and S. pearsonii. Fungal Ecol. 39: 131-141.

Holden, E.M., 2005. Squamanita pearsonii collected in Aberdeenshire. Field Myclogy 6: 10-11.

Læssøe, T., 2012. Pearsons Knoldfod (Squamanita pearsonii) fundet som ny for Danmark i Nordvestsjælland. Svampe 65: 38-45.

van Heerden, P., Thorn, G., Voitk, A., 2018. Squamanita pearsonii. Omphalina 9: 3-6


Known distribution - countries

Regional Population and Trends

Country Trend Redlisted