E-Flora BC: Electronic Atlas of the Flora of British Columbia

Summary:
Features include 1) a yellow-brown to red-brown, glutinous cap that often has hanging veil remnants and sometimes scattered patches near the cap margin, 2) white to yellow flesh that becomes pinkish around larval tunnels, 3) small, round, ocher-yellow unchanging pores, 4) a white to yellow stem that is often short and has obscure glandular dots and usually a fibrillose annulus.

Suillus pseudobrevipes is found at least in ID and WY, (Smith). RANGE includes the Rocky Mountains, the southwestern US, and CA, (Bessette). There are collections at the University of Washington from WA, OR, MT, and WY, and at the University of British Columbia from BC. There is some DNA support for the occurrence of this species in BC (D. Miller, pers. comm.)

Cap:
6-14cm, convex becoming broadly convex to nearly flat when old; "honey-yellow to dark yellow-brown or dark reddish brown"; glutinous becoming viscid when old, usually bald but sometimes appearing fibrillose-streaked under gluten; margin with hanging veil remnants, and remaining incurved well into maturity, (Bessette), 6-14cm, convex to broadly convex, finally nearly flat; honey-yellow to "clay color" (Ridgway color) or a darker yellow brown; glutinous at first, finally merely viscid, "bald or at times with thin white patches of veil material scattered near the margin", at times appearing fibrillose-streaked under gluten; margin frequently with hanging veil remnants, (Smith), "dingy yellowish to yellow-brown, dark yellow-brown, or honey-colored", often becoming darker or more cinnamon when old, (Arora)

Flesh:
white to pale yellow and becoming darker when old, unchanging when exposed, (Bessette), thick; "pale yellow or white at first then becoming yellow", unchanging when bruised but dingy pinkish around larval tunnels; in stem white but pinkish around larval tunnels and often brownish in base, (Smith)

Pores:
2-3 per mm, round; ocher-yellow, unchanging when bruised; tube layer 0.6-1cm thick, slightly depressed to subdecurrent, (Bessette), +/-3 per mm, round; ocher yellowish, not staining when bruised; tube layer 0.6-1cm thick (in 14cm caps), slightly depressed around stem to short decurrent, pale dingy yellow becoming dull ocher yellow by maturity, (Smith)

Stem:
2-8cm x 1-3cm, nearly equal or narrowing downward, solid; white at first, becoming yellowish when old; dry, glandular dots whitish, obscure when young; partial veil typically sheathing lower half of stem, "usually forming a median annulus or annular zone", (Bessette), 2-8cm x 1-3cm, equal or narrowing downward, solid; white at first, yellowish when old; bald at first, reticulate in upper part when old from decurrent tubes, glandular dots present as whitish spots when young, not darker when old or only slightly so (in another part of description refers to "the almost complete absence of glandular dots on the stipe"); "veil leaving a median annulus or more rarely a fibrillose zone, typically sheathing lower half of stipe with floccose to submembranous avellaneous material which is soft and finally collapses to form a single ring", (Smith), dots absent or obscure when young but tending to become brown or more visible when old; veil "white to dingy lavender or lavender-brown", usually forming a median fibrillose annulus on stem, but annulus often slight or collapsed, (Arora)

Chemical Reactions:
flesh slowly stains olive with application of FeSO4 (Bessette)

Odor:
not distinctive (Bessette, Smith)

Taste:
slightly acidic or not distinctive (Bessette), mild to slightly acidulous, (Smith)

Microscopic:
spores 7-9 x 2.5-3 microns, oblong, smooth, pale ochraceous, (Bessette), spores 7-9 x 2.5-3 microns, oblong, smooth, pale ochraceous in KOH, slightly darker in Melzer''s reagent, wall slightly thickened but less than 0.5 microns; basidia 4-spored, 14-18 x 5.5-7 microns, short-clavate, colorless in KOH; pleurocystidia projecting slightly from hymenium, 20-30 x 9-10 microns, short-clavate, "in fascicles and these surrounded by copious rusty brown amorphous pigment", "individual cystidia with ochraceous to rusty brown content as revived in KOH", cheilocystidia 20-30 x 5-7 microns, subcylindric to subfusoid, content ochraceous to rusty brown; cap epicutis a gelatinous trichodermium of hyphae (3)4-12 microns wide, "mostly unbranched, becoming decumbent on cap surface", greenish-transparent in KOH and with scattered colorless granules in the interior; caulocystidia resembling cheilocystidia in size, shape and color, "rare, a few in a fascicle and fascicles rare to scattered, visible in the caulohymenium because of the brown amorphous pigment deposits"; clamp connections absent, (Smith), spores 7-9 x 2.5-4 microns, spindle-shaped to elliptic, (Arora)

Spore Deposit:
cinnamon-buff (Bessette), near "cinnamon buff" (Ridgway color), (Smith)