Observation 154069: Suillus kaibabensis Thiers
When: 2013-12-01

Notes: In irrigated grass under introduced aleppo pine (Pinus halepensis); approximately 30 individuals in circle at drip line. Cap up to 8 cm., pallid with bright yellow tinges and red patches at margin, kid leather feel when dry, sticky when wet. Pores large, angular, yellow brown. Tubes yellow brown and up to 1 cm. Stem 4 cm. × 2 cm., curved, tapering and reddish at base, pallid with sparse elongated reddish dots. Flesh of cap and stem firm and yellow white. Mild but odd odor. Pleasant taste to cap flesh but cuticle is tart. Cap surface and flesh of cap and stem reddish with ammonia. Cap surface and flesh of cap and stem black with KOH. Spore deposit cinnamon brown. Last rains a week ago. Elevation 3200’, temps 60’s day/ 35-40’s night.

PS I now think this is S. kaibabensis due to marginal flaps on cap (according to Kuo none on S. occidentalis) and red stains on stem base. Association with something other than ponderosa pine is apparently not documented.


Reddish with Ammonia on cap surface
Black with KOH on cap surface
Ammonia reddish on flesh; KOH black on flesh
associated tree—introduced aleppos pine—2 needle
cinnamon brown spore deposit

Proposed Names

28% (1)
Recognized by sight
-31% (2)
Recognized by sight: Based on macroscopic features and reagent reactions this looks to be S. sibiricus but I could find no reference to its association with 2 needle pine like the allepo.
Used references: Kuo, M. (2007, December). Suillus sibiricus. Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/suillus_sibiricus.html
Based on chemical features: see above
31% (2)
Recognized by sight: Just a guess as I have never seen this species.
62% (3)
Eye3 Eyes3
Recognized by sight: This is a fairly common species in the Four Corners area under Pinus ponderosa. We see it every summer by my grandfather’s old cabin in Groom Creek, outside Prescott, at about 6500 feet.
Based on chemical features: KOH/ammonia colors look just like Kuo’s reference and distinguish it from S. granulatus.

Please login to propose your own names and vote on existing names.

Eye3 = Observer’s choice
Eyes3 = Current consensus


Add Comment
Thanks, Walt
By: Terri Clements/Donna Fulton (pinonbistro)
2013-12-03 08:36:47 PST (-0800)

I’ve done some research since your proposal and S. occidentalis has been recorded from Az in association with ponderosa pine, a 2-3 needle pine like the aleppo pine. In fact it seems to be reasonably common according to a recent article in Mycologia ( www.mycologia.org/content/102/2/438.full ) which discusses it in relation to a new species (S. quiescens) described from California and Oregon. Both the description by Thiers and the online photo from Dr. Scott Bates of ASU make the ID of S. occidentalis promising I think.


Alan or Walt
By: Terri Clements/Donna Fulton (pinonbistro)
2013-12-02 21:41:26 PST (-0800)

Would you mind looking at this? S. sibiricus seems a fit except for the association here with 2 needle pine rather than 5 needle.



Created: 2013-12-02 19:07:51 PST (-0800)
Last modified: 2016-07-20 21:09:18 PDT (-0700)
Viewed: 105 times, last viewed: 2016-10-24 05:52:16 PDT (-0700)
Show Log