Castellano, M.A., E. Cazares, B. Fondrick, and T. Dreisbach. 2003. Handbook to additional fungal species of Special Concern in the Northwest Forest Plan. Gen. Tech. Rep. PNW-GTR-572. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 144 pp. Online. Available: https://www.fs.usda.gov/pnw/pubs/pnw_gtr572.pdf
Conservation Status
Review Date2006-06-30
Change Date2002-11-17
Edition Date2002-11-17
Edition AuthorsFrancisco J. Camacho
Threat ImpactMedium
Range Extent5000-20,000 square km (about 2000-8000 square miles)
Number of Occurrences> 300
Rank Reasons
Known from Oregon and California. There are many collections of this species and it does not occur in heavily truffled areas. I have found it in the central Sierra Nevada.
Range Extent Comments
Known from Oregon and California.
Occurrences Comments
Known from over 50 collections.
Threat Impact Comments
This is a mycorrizhal species; it is dependent on a host tree for its carbohydrates. Studies have shown that if the tree is killed the mycorrizhal fungi die shorty after. The one possibly saving feature of this species is the spore bank. However, nothing is known about the spore bank of this species.
Castellano, M.A., E. Cazares, B. Fondrick, and T. Dreisbach. 2003. Handbook to additional fungal species of Special Concern in the Northwest Forest Plan. Gen. Tech. Rep. PNW-GTR-572. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 144 pp. Online. Available: https://www.fs.usda.gov/pnw/pubs/pnw_gtr572.pdf
Index Fungorum and Species Fungorum. 2018. <i>In</i> Index Fungorum-Species Fungorum (<a href="https://indexfungorum.org" target="_blank">https://indexfungorum.org</a> and <a href="https://speciesfungorum.org" target="_blank">https://speciesfungorum.org</a>) database export on 16 June 2018. Royal Botanic Gardens, Kew.
Index Fungorum and Species Fungorum. 2025. <i>In</i> Index Fungorum-Species Fungorum (<a href="https://indexfungorum.org" target="_blank">https://indexfungorum.org</a> and <a href="https://speciesfungorum.org" target="_blank">https://speciesfungorum.org</a>) database export on 29 September 2025. Royal Botanic Gardens, Kew.
Miller, S.L. 1986. Hypogeous fungi from the southeastern United States. I. The genus Rhizopogon. Mycotaxon 27: 193-218.
MycoBank. 2025. MycoBank database download, export date January 2025. International Mycological Association. [http://www.mycobank.org]