Type: Colorado

Cap: 5-15 cm; convex becoming broadly convex; sticky or fairly dry; at first covered with a fine, grayish, felty covering, but often becoming smoother with age; yellow to orangish yellow; sometimes developing reddish spots and stains; the margin at first inrolled.

Pore Surface: Brownish to cinnamon when young, becoming brownish yellow to olive yellow; bruising blue; 1-2 angular pores per mm; tubes to 2 cm deep.

Stem: 4-12 cm long; 1-3 cm thick; equal or somewhat club-shaped; yellowish orange; covered with brownish glandular dots; staining brownish on handling; without a ring.

Flesh: Whitish to yellowish in the cap; yellow in the stem; bluing on exposure.

Odor and Taste: Not distinctive.

Chemical Reactions: Ammonia reddish to grayish or negative on the cap surface; brownish on flesh. KOH pinkish, then purple on cap surface; dark brown on flesh. Iron salts greenish to grayish on cap surface; gray to brown on flesh.

Spore Print: Olive brown when fresh, drying cinnamon brown.

Microscopic Features: Spores 7-12 × 3-5 µ; smooth; subfusoid.