Observation 171623: Chalciporus rubinellus (Peck) Singer
When: 2014-07-28
Collection location: Perry, Maine, USA [Click for map]
No herbarium specimen

Notes: 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.

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
-28% (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


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Thanks, Christian
By: Terri Clements/Donna Fulton (pinonbistro)
2014-07-29 13:04:57 PDT (-0700)

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 12:54:05 PDT (-0700)

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 12:32:50 PDT (-0700)

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 09:16:39 PDT (-0700)
Last modified: 2014-07-29 13:05:15 PDT (-0700)
Viewed: 50 times, last viewed: 2016-10-22 20:49:39 PDT (-0700)
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