Please do not re-click a link while waiting for a page to load. (It’s slower and degrades site speed for all users.)
To get images for machine learning, see MO Images for Machine Learning


When: 2001-06-30

Collection location: Larch Mountain, Multnomah Co., Oregon, USA [Click for map]

Who: Daniel B. Wheeler (Tuberale)

No specimen available

The most distinctive feature of Gastroboletus turbinatus is the extremely fast (less than 1 second) blueing of any cut surface, especially any portion of the stipe. Color change seems to be in response to oxygen in the atmosphere. Stip changes from straw/orange to dark purplish/blue. I have tried to capture that change on film, but the process is too fast for my reflexes. Blueing continues for at least 10 seconds, becoming darker until the maximum is reached about 10 seconds later. Pores are convoluted and twisted, rarely allowing any spores egress; stipe is present, noticeably larger/thicker at the base than where attached to the cap. Size varies considerably from less than 1 inch across the cap to over 4 inches; usually barely erumpent in duff but in age can be completely above ground; spore mass may be nearly completely covered as in a button mushroom (especially when young); or exposed to the air in age. Often found barely visible in the duff/humus layer, somtimes with a cap of humus on top of sporocarp.

Species Lists


Pen in photo is 6 inches long for comparison.
Pen in photo is 6 inches long for comparison.

Proposed Names

86% (1)
Recognized by sight
Used references: Aurora, David Mushrooms Demystified
Positive identification of collection submitted to Dr. James Trappe and lodged at Oregon State Herbarium

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

= Observer’s choice
= Current consensus


Add Comment
No one has commented yet.