• Proposed
  • Under Assessment
  • Preliminary Assessed
  • DDAssessed
  • Published

Boletus peckii Frost

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Scientific name
Boletus peckii
Common names
IUCN Specialist Group
Mushroom, Bracket and Puffball
Assessment status
Proposed by
Noah Siegel
Noah Siegel
Comments etc.
Anders Dahlberg

Assessment Notes


Once a common and widespread species in eastern USA with many reports prior to 1945, it has all but disappeared. The name has been misapplied to other species, and a evaluation of more modern (post 1970) records need to be examined. It now is rarely reported, and some of the recent records are questionable. Until these records are assessed, we have to consider this species as Data Deficient.


Taxonomic notes

This species was placed into Butyriboletus, based on a genetic sequence from Ron Petersen’s 1963 collection from Tennessee, in “Three new combinations of Butyriboletus (Boletaceae) ” Kuan Zhao, Gang Wu, Roy Halling, Zhu L. Yang 2015. It is likely that this specimen was misidentified. Vizzini had placed it in Caloboletus in 2014 because of it’s reported bitter taste ((Index Fungorum № 146).
Igor Safonov wrote up and sequenced a collection from New Jersey that is likely this species. Further examination of the type collection is needed. Until this happens, we should gather data on the species described on Mushroom Observer OB#246697, and assume that it is Boletus peckii. http://mushroomobserver.org/246697?q=2IWV

Why suggested for a Global Red List Assessment?

Geographic range

Reported from eastern North America, from central New Hampshire and Vermont, south through the mountains into northern Georgia, west to Indiana Records on the gulf coast (Florida into eastern Texas) are questionable, and are being regarded as a distinct species. Reports from Michigan are likely Boletus pseudopeckii.

Population and Trends

This species appeared to be very common in the early 1900’s with many collections in the Northeast.  There are 138 herbarium collections reported on MycoPortal, but only 8 since 1970, and 27 since 1950. Despite extensive collecting by Noah Siegel for many years around the type location, this species has never been seen.

Population Trend: Uncertain

Habitat and Ecology

Ectomycorrhizal fungus in hardwood forest of eastern North America. Preferred ECM host tree are unknown.

Temperate Forest


Apparent decline of species uncertain. Possibly due the the loss of American Chestnut (Castanea dentata). The disappearance of herbarium specimens seems to coincide with the timeline of the loss of American Chestnut in eastern hardwood forest due to the Chestnut Blight, (Cryphonectria parasitica).

Conservation Actions


Research needed

Modern collections, and a better understanding of this species, and it’s preferred ecology and host trees are needed.

TaxonomyLife history & ecology

Use and Trade


Bessette, A., Roody, W.C. & Bessette, A.R. (2000) North American boletes: a color guide to the fleshy pored mushrooms. Syracuse University Press, New York, 396 pp.

Kuan Zhao, Gang Wu, Roy Halling, Zhu L. Yang (2015) Three new combinations of Butyriboletus (Boletaceae).  Phytotaxa 234 (1) 51-62

Peck, C.H. (1878) Annual Report on the New York State Museum of Natural History 29: 29–82.

Vizzini, A. (2014b) Nomenclatural novelties. Index Fungorum 146: 1–2.

Safonov, IG. 2016 Mushroom Observer. http://mushroomobserver.org/246697
http://mycoportal.org (2016)

Known distribution - countries

Regional Population and Trends

Country Trend Redlisted