Grandparent group: Suillus spectabilis group sensu Nguyen et al.
Parent clade: Suillus lakei clade sensu Nguyen et al.
Closely related to Suillus ponderosus which has a yellow to orange veil and a smoother, more viscid pileus. S. caerulescens has a white veil. Tom Bruns mentioned in a talk at SOMA Camp 2008 that molecularly the two species are very close, but reliably distinguishable as separate species.
Cap: 6-14 cm; convex becoming broadly convex or flat; moist or fairly slimy; smooth or with patches of appressed fibers or scales; yellowish brown to tawny or cinnamon brown; the margin sometimes hung with partial veil remnants.
Pore Surface: Yellowish; bruising slowly reddish brown; pores angular and radially arranged (but not boletinoid), about 1-2 mm across; tubes to about 1 cm deep.
Stem: 3-8 cm long; 2-3 cm thick; more or less equal, or tapered in either direction; solid; often finely reticulate near the apex; smooth or with appressed hairs; lacking glandular dots; yellowish above, dingy to brownish below; bruising brown; with a whitish, dry ring that soon collapses or disappears entirely.
Flesh: Pale yellow; staining blue in the stem base when exposed, elsewhere not staining or staining pinkish to brownish.
Odor and Taste: Mild or slightly acidic.
Chemical Reactions: Ammonia grayish on cap; pale grayish lilac on flesh. KOH olive gray becoming dark gray on cap; dark gray on flesh. Iron salts olive on cap; olive to bluish on flesh.
Spore Print: Cinnamon brown.
Microscopic Features: Spores 8-11 × 3-5 µ; smooth; subfusoid.
Created: 2007-01-09 23:03:40 CST (-0600) by Nathan Wilson (nathan)
Last modified: 2019-10-15 18:42:32 CDT (-0500) by Joseph D. Cohen (Joe Cohen)
Viewed: 892 times, last viewed: 2020-03-20 07:03:14 CDT (-0500)