Summary:
Features include 1) a bald, glutinous to viscid cap that is yellow to ochraceous and has a margin with narrow band of sterile tissue at first, 2) flesh that is white except for yellow in the top of the stem and sometimes brown in stem base, 3) large yellow unchanging pores, 4) a whitish to yellow stem that develops pinkish brown dots but does not have a veil or an annulus, and 5) growth under pines. Nguyen(3) provide molecular evidence that the type of S. flavogranulatus is Suillus lakei, which is surprising because the descriptions are so different.
Suillus flavogranulatus is found in BC, ID, and WA, (Bessette).
Cap:
6-9cm, convex becoming nearly flat; pale yellow at first, becoming pale ochraceous when mature; bald, glutinous to viscid; "margin with a narrow band of sterile tissue when young", even or nearly so when mature, (Bessette), 6-9cm, convex expanding to flat or nearly so; pallid under the slime (which becomes smoky-colored), then pale yellow to pale ochraceous; bald and with a naked margin when young, covered with slime, (Smith)
Flesh:
white, but yellow in top of stem, not staining in cap when exposed but sometimes brown in stem base when old, (Bessette), thick; white except yellow in stem [or perhaps only top of stem, unclear from description], unchanging when cut except in base slowly changing to pinkish brown, (Smith)
Pores:
1-2.5mm, somewhat elongated and irregular; yellow to dingy yellow, not turning blue when bruised; tubes 0.6-1cm thick, depressed near stem when old, (Bessette), 1-2(2.5)mm, more or less isodiametric (scarcely any boletinoid configuration), yellow and becoming glandular dotted; but layer up to 1cm thick, depressed around stem, pale dingy yellow and unchanging, (Smith)
Stem:
3-5cm x 1.2-2cm, nearly equal, solid; whitish at first becoming yellow; dry, developing numerous pinkish brown glandular dots on upper two-thirds; partial veil and annulus absent, (Bessette), 3-5cm x 1.2-1.8cm, equal or nearly so, solid; white, slowly becoming yellow, base brown only when old; with numerous pinkish brown glandular dots over upper 2/3, (Smith)
Chemical Reactions:
flesh stains pinkish then dull lilac with application of KOH and olive with FeSO4, (Bessette)
Taste:
not distinctive (Bessette), mild (Smith)
Microscopic:
spores 7.5-9 x 3-3.5 microns, oblong, smooth, pale yellow, (Bessette), spores 7.5-9 x 3-3.2 microns, oblong, smooth, somewhat dextrinoid, yellowish to nearly colorless in KOH; basidia "4-spored in some areas, many with vinaceous to vinaceous-brown content (as revived in KOH)"; pleurocystidia clustered, 40-56 x 7-10 microns individually, "clavate to subfusoid or subcylindric, content lilaceous when first revived in KOH, but soon dull vinaceous-red to vinaceous-brown, pigment diffused throughout the cell and in amorphous masses around the bundle"; cap cuticle an outer gelatinous trichodermium of hyphae 3-8(10) microns wide "with much granular material around and along the granular sheath"; caulocystidia in clusters and similar to pleurocystidia in size, shape and color in KOH; clamp connections none, (Smith)
Spore Deposit:
pale rusty cinnamon, (Bessette), "pale rusty cinnamon after escape of moisture", (Smith)
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