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Boletus subtomentosus

Boletus subtomentosus

Common Name: None


Substrate: Ground

Location: Hardwood Forests

Spore Color: Unknown. Likely olive brown.

Pore Surface: Yellow becoming olivaceous. Bruises blue.


Consider this a tentative ID, because I do not have a very firm grasp on this species. There is also lots of variability within this name for the East and West Coast. 

The first thing to do if you are considering this species, is to put a drop of ammonia on the cap and see if there is a reaction. I described it as reddish purple, others describe it as mahogany red or reddish brown. 

The cap should be slightly velvety, olive brown to yellow brown. Sometimes slightly reddish in age. Also often cracked with age. Narrow band of sterile tissue along the margin.

The pore surface is yellow, and bruises blue, and eventually stains olive. 

The stem is primarily yellow, with reddish brown streaks and stains. Sometimes with raised longitudinal lines. 

Chemical Reactions:

NH4 – Cap: reddish purple turning yellow-orange
KOH – Cap: reddish purple turning yellow-orange
FE – Cap: grayish


Boletus spadiceus is very similar, but it has a green flash then stains reddish brown with NH4.


Boletus subtomentosus


9/16/12 - Leonard Springs - Bloomington, IN


Boletus subtomentosus

9/16/12 - Leonard Springs - Bloomington, IN