Where’s Wildlife · Mushroom Field Guide
Tylopilus rubrobrunneus
Pronounced (approx.): ty-LOP-ih-lus roo-broh-BROON-ee-us
A hardwood-associated bolete with purple-brown to brown caps and pores that become pinkish with age.
Reddish Brown Bitter Bolete. Select the photo to browse the gallery. Photographs © Where’s Wildlife.
NATIVE
Fruiting varies with local weather and habitat.
Purple-brown caps fading toward brown
Whitish pores becoming pinkish
Pale stems that may develop olive tones
Compare form, texture and growing surfaces in the photographs below.
Identification supplied by the photographer. The Beulah Bog photographs include underside views; the Ryerson Woods set shows caps and stems. Both were found in oak-containing hardwood forest.
Similar Tylopilus species overlap in appearance. These photographs and field details support the proposed identification but do not conclusively exclude look-alikes. Bruising reactions and additional specimen characters were not documented.
Hardwood forest, especially with oaks. Summer and fall.
Forms mycorrhizal associations with tree roots. The visible mushrooms produce spores on the pore surface.
Young caps can be purple-brown before fading toward brown.
The pore surface becomes pinkish with maturity.
Host trees, stem details and bruising reactions help distinguish similar species.
Photographed at Beulah Bog, Wisconsin, and Ryerson Woods, Illinois, in hardwood forest with oaks.
Explore reported sightings on iNaturalist. Observation records are not a complete range map.
Photographs © Where’s Wildlife.
Identification notes & comments
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