Suillus tomentosus

The cap is {{Cvt|5-12|cm|frac=8}} wide,{{Cite book|last1=Davis|first1=R. Michael|url=https://www.worldcat.org/oclc/797915861|title=Field Guide to Mushrooms of Western North America|last2=Sommer|first2=Robert|last3=Menge|first3=John A.|publisher=University of California Press|year=2012|isbn=978-0-520-95360-4|location=Berkeley|pages=334–335|oclc=797915861}} pale to orange-yellow with grayish brownish or reddish tomentum, and viscid while fresh. The fibrillose-scaly surface of the cap helps distinguish it from other species in the genus.{{cite web|title=Suillus tomentosus |url=http://www.mykoweb.com/boletes/species/Suillus_tomentosus.html|access-date=29 January 2010|work=MykoWeb}} The tubes are yellow and become blue when bruised.{{cite book | last = H. Smith | first = Alexander | title = The Mushroom Hunter's Field Guide | publisher = The University of Michigan Press | year = 1974 | pages = 86 }} It has no veil. The stipe is {{Cvt|3-11|cm|frac=2}} tall and 1–3 cm wide,{{Cite book |last=Audubon |title=Mushrooms of North America |publisher=Knopf |year=2023 |isbn=978-0-593-31998-7 |pages=306}} glandular dotted and the color is similar to the cap.{{cite book|last=Trudell|first=Steve|url=https://books.google.com/books?id=WevHvt6Tr8kC&q=Suillus+tomentosus&pg=PA224|title=Mushrooms of the Pacific Northwest|author2=Ammirati, Joe|publisher=Timber Press|year=2009|isbn=978-0-88192-935-5|series=Timber Press Field Guides|location=Portland, OR|pages=224–225}}

The spore print is dark olive brown to brown.{{cite web|url=http://www.mykoweb.com/boletes/species/Suillus_tomentosus.html |title=Suillus tomentosus |access-date=2010-01-28 |work=MykoWeb }} The spores are brownish when they are young.{{Cite book |last=Arora |first=David |author-link=David Arora |url=https://archive.org/details/arora-david-mushrooms-demystified-a-comprehensive-guide-to-the-fleshy-fungi-ten-speed-press-1986/page/504/mode/2up |title=Mushrooms Demystified: A Comprehensive Guide to the Fleshy Fungi |publisher=Ten Speed Press |year=1986 |isbn=978-0-89815-170-1 |edition=2nd |location=Berkeley, CA |pages=504-505 |orig-date=1979}} The species stains fingers blue.{{cite book | last = Multiple authors | title = North American boletes: a color guide to the fleshy pored mushrooms | publisher = Syracuse University Press | year = 2000 | pages = 255 | url = https://books.google.com/books?id=geiwy6Jf_ZcC&q=Suillus+tomentosus&pg=PA255 | isbn = 978-0-8156-0588-1 }} The yellow interior of the mushroom should slowly turn green-blue when cut with a knife.{{cite book |last=Whitney |first=Stephen |title=Western Forests (The Audubon Society Nature Guides) |date=1985 |publisher=Knopf |location=New York |isbn=0-394-73127-1 |page=496 |url=https://archive.org/details/westernforests00whit/page/496 }}

Similar species include S. fuscotomentosus, S. reticulatus, S. variegatus, and Boletus subtomentosus.

The species is commonly found in the Rocky Mountains of Idaho and the Pacific Northwest. It is less common in the lake states. The species fruits in the summer in the Rockies and in autumn along the Pacific coast and in the lake states. The species is by itself or scattered in mixed forests.{{cite book | last = Multiple authors | title = The Macrofungus Flora of China's Guangdong Province | publisher = Chinese University Press | year = 1997 | pages = 471 | url = https://books.google.com/books?id=0cAered-vqYC&q=Suillus+tomentosus&pg=PA471 | isbn = 978-962-201-556-2 }} The species can commonly be found under lodgepole pines or other two-needle pines. It is rarely found under jack pines.{{cite book |last1=Miller Jr. |first1=Orson K. |author-link=Orson K. Miller Jr. |title=North American Mushrooms: A Field Guide to Edible and Inedible Fungi |last2=Miller |first2=Hope H. |publisher=FalconGuide |year=2006 |isbn=978-0-7627-3109-1 |location=Guilford, CN |pages=359}}

Suillus tomentosus forms tuberculate ectomycorrhizae (mycorrhizae that are nodular) with lodgepole pine (Pinus contorta var. latifolia). Recent work has shown that acetylene is reduced by the nodules which means that nitrogen is being fixed by bacteria within the nodules. This system is functionally similar to the root nodules in legumes like clover. Lodgepole pine can be found growing on gravel pits or other extremely nitrogen deficient soils. Lodgepole pine with its S. tomentosus symbiont is one of the most common pioneer species in northern forests. It colonizes highly disturbed soils and creates an environment suitable for other species to colonize.

The mushroom may be edible to some while others may find its taste acidic even after cooking. The species has been known to cause gastric upset in some people. According to David Arora, the species is of the same quality as S. fuscotomentosus. Arora reports that one collector stated the mushroom smells and tastes like Tootsie Rolls when dried.{{cite book |last=Arora |first=David |url=https://books.google.com/books?id=87ct90d4B9gC&q=Suillus+tomentosus&pg=PA178 |title=All That the Rain Promises and More: A Hip Pocket Guide to Western Mushrooms |publisher=Ten Speed Press |year=1991 |isbn=978-0-89815-388-0 |pages=178}} The species have also been said to smell like almonds. When they look for this species, consumers are advised to be careful to distinguish it from other species that stain blue but are poisonous.{{cite book |last=Multiple authors |url=https://books.google.com/books?id=kSdA3V7Z9WcC&q=Suillus+tomentosus&pg=PA208-IA22 |title=A Field Guide to Mushrooms: North America |publisher=Houghton Mifflin Harcourt |year=1998 |isbn=978-0-395-91090-0 |page=208}}

• List of North American boletes

{{Reflist|refs=

{{cite journal| journal=Annals of Botany| volume=99| pages=1101–1109| year=2007| doi=10.1093/aob/mcm061| title=Nitrogen Fixation Associated with Suillus tomentosus Tuberculate Ectomycorrhizae on Pinus contorta var. latifolia| first1=L.R.| last1=Paul| first2=B.K.| last2=Chapman| first3=C.P.| last3=Chanway| url= | pmid=17468111| issue=6| pmc=3243579}}

[http://article.pubs.nrc-cnrc.gc.ca/ppv/RPViewDoc?issn=1208-6037&volume=36&issue=2&startPage=460], Paul, Chapman and Chanway, Can. J. For. Res. Vol. 36, 2006.

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Category:Edible fungi

tomentosus

Category:Fungus species