Observation 177472: Boletus rubripes Thiers
When: 2014-08-27
(34.4321° -111.3275° 2m)

Notes: Growing on the ground under Ponderosa pine and Gambel’s oak.

Rapidly blue-staining pores and flesh when bruised or cut, slowly fading to tan over about 15 minutes.

Disgustingly bitter taste.

I saved a longitudinal slice from the center of the specimen and dried it. I will probably submit it to the Arizona Mycota Project.

Could also be B. calopus.

See a video of the staining at: http://vimeo.com/104687170


Blue stain at bottom 30 sec after bruising. Brownish stains at top are 15 minutes after bruising.
Bruised and unbruised pores.
This shows the pink tinge with faint white reticulation near the top of the stipe.
Again, bruised/stained vs intact pores.
Close-up of pores. Next time I’ll add a coin or matchstick for scale.
A slightly less magnified view of the pores & top of the stipe.
This one gives a better view of the stipe and its reticulation.
The center of the pileus. Dry, with a tan backdrop and darker brown macules. Other areas of the cap were more homogeneous.
Flesh instantly stains blue when cut.
It’s quite a rich indigo blue, and it appears before you can pull your knife out of the cut.
Close-up of blueing in the cut flesh.
An even closer view of the blued flesh after cutting the cap. Plus, the tubes of the hymenium viewed in longitudinal section.
The blueing slowly fades to tan. This is about 15 minutes after the cut was made.

Proposed Names

27% (1)
Eye3 Eyes3
Used references: Mushrooms Demystified/Arora, MushroomExpert.com/Kuo
27% (1)
Recognized by sight

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Eye3 = Observer’s choice
Eyes3 = Current consensus


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Created: 2014-09-09 17:59:59 HST (-1000)
Last modified: 2014-09-09 19:06:11 HST (-1000)
Viewed: 34 times, last viewed: 2016-09-05 13:49:35 HST (-1000)
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