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Tylopilus rubrobrunneus

Common Name: None

Synonyms: 

Substrate: Ground

Location: Hardwood forests

Spore Color: Pinkish brown 

Pore Color: Whitish becoming pinkish; Bruises brown

Comments: 

This group of Boletes can be tough to separate out sometimes. Tylopilus is most often defined by a pinkish pore surface, but you will not see the pink in this mushroom until it begins to age. The pore surface starts off brownish, becoming dull white, then pinkish. Mature specimens likely have a pinkish-brown to brown pore surface.

When looking to ID this species, the first thing to look for is the extremely bitter taste. If it has that, then the Tylopilus species you have is likely Tylopilus felleus or this species. Finalize with no reticulation on the stem. T. felleus should have prominent reticulation.

Chemical Reactions:

KOH: Cap - Purple areas bleach pinkish brown. Context - No reaction. Stem - Mahogany Red. Pore Surface - Orange Brown.
NH4: Cap - Purple areas bleach pinkish brown. Stem - Mahogany Red. Context - No reaction.
Iron Salts: Cap - No reaction. Context - Pink to purplish. Stem - Green.

Lookalikes:  

Tylopilus felleus also has an extremely bitter taste, but has prominent reticulation on the stem. Tylopilis violatinctus has a pale purplish cap when young and does not develop olive-brown stains on the stalk. Tylopilus plumbviolaceus also has a bitter taste, but has purplish tones to the stem. Tylopilus badiceps lacks a bitter taste. 

Pictures:

Tylopilus rubrobrunneus

8/25/12 - Shades State Park - Rockville, IN

Tylopilus rubrobrunneus

Tylopilus rubrobrunneus

Tylopilus rubrobrunneus

9/15/12 - McCormicks Creek SP - Spencer, IN

Tylopilus rubrobrunneus

9/19/12 - Griffey Woods - Bloomington, IN

Tylopilus rubrobrunneus

9/24/12 - Paynetown SRA - Bloomington, IN

Tylopilus rubrobrunneus

NH4 turned brown areas on stem dark red. Not very confident on this ID.

Tylopilus rubrobrunneus

Tylopilus rubrobrunneus

9/26/12 - Deam Wilderness - Hoosier National Forest - Monroe County, IN

Tylopilus rubrobrunneus

Tylopilus rubrobrunneus

Tylopilus rubrobrunneus

9/20/12 - Morgan Monroe State Forest - Monroe County, IN

Tylopilus rubrobrunneus

Unknown date & location