Observation 171623: Chalciporus rubinellus (Peck) Singer

When: 2014-07-28

Collection location: Perry, Maine, USA [Click for map]

Who: Terri Clements/Donna Fulton (pinonbistro)

No specimen available

On ground in mixed woods that include balsam fir, white pine, hemlock,cedar birch and beech. Cap up to 8 cm. Heavy rains overnight. Brown spore deposit.


cap slimy when wet
yellow tubes
radially aligned angular pores
reddish fibrils

Proposed Names

-44% (2)
Recognized by sight: Yellowish cap with matted red fibrils and inrolled sterile margin, yellow orange radially aligned angular pores, yellow stem with red brown smears, yellow flesh which reddens on cutting
Used references: Key C, p. 36, "North American Boletes: by BRB, description p. 253
Based on chemical features: Ammonia on cap green; Iron salts on flesh green
-29% (1)
Recognized by sight: umbo, red staining flesh but macrochemical tests don’t fit and no sign of partial veil remnants even in young fB’s

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Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Thanks, Christian
By: Terri Clements/Donna Fulton (pinonbistro)
2014-07-29 16:04:57 CDT (-0400)

for the detailed response. The size and sliminess of the cap made me think Suillus but Chalciporus seems a better proposal given the shape of the cap and color of the pores.

By: Christian (Christian Schwarz)
2014-07-29 15:54:05 CDT (-0400)

The size doesn’t matter much.
The rounded-conical cap, coppery-pink pores, and yellow and pink in the stipe point to C. rubinellus.
As far as macrochemical reactions go… that’s a mess I can’t really weigh in on. It seems to be variable, often poorly researched and reported for many taxa (especially boletes).
See some of the photos here:


As compared to Chalciporus rubinellus
By: Terri Clements/Donna Fulton (pinonbistro)
2014-07-29 15:32:50 CDT (-0400)

this obs has a larger cap, up to 8 cm. here vs 2-4.5 cm; yellow tubes and pores initially vs. red; and ammonia on the cap is green vs red then orange.

Created: 2014-07-29 12:16:39 CDT (-0400)
Last modified: 2014-07-29 16:05:15 CDT (-0400)
Viewed: 51 times, last viewed: 2017-06-18 13:37:52 CDT (-0400)
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