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

Summary:
Features include 1) a viscid cap that is greenish yellow (with an often brownish-tinged disc and scattered fibrils and scales), 2) notched, close, white gills, 3) a white stem that is sometimes pale yellow in places, 4) a farinaceous odor and taste, 5) a white spore deposit, and 6) elliptic, smooth, inamyloid spores. The description derived from Ovrebo(1) is for Tricholoma leucophyllum Ovrebo & Tylutki. Peck''s original description of Tricholoma intermedium is also given. Shanks describes T. intermedium Peck, giving Tricholoma leucophyllum Ovrebo and Tylutki as a synonym. This view is followed by Bessette(5) but they note that not all mycologists agree with the synonymy. The online Species Fungorum, accessed May 3, 2016, maintains them separately.

Tricholoma intermedium has been found at least in ID (Ovrebo), CA (Shanks), and northeastern North America (Bessette(2)), including WV (Bessette(5)). It was reported from AB by Schalkwijk-Barendsen who calls it a Pacific Northwest species. Bessette(5) say it is widely distributed across northern N. America, extending south along the West Coast to CA. There is a collection from BC at Pacific Forestry Centre (as T. leucophyllum), and eleven collections from BC at the University of British Columbia (4 as T. intermedium and 7 as T. leucophyllum). There are two collections from ID at the University of Washington (1 as T. intermedium and 1 as T. leucophyllum). It was reported from WA by Andrew Parker, pers. comm.

Cap:
3.5-10cm across, convex, often with rounded or subacute umbo; yellowish tan to olive-tan over the disc, elsewhere light yellow, often fading when old; viscid becoming dry, bald or minutely areolate-squamulose over disc, elsewhere bald and often with scattered minute squamules [fine scales] or appressed fibrils, (Shanks, who also characterizes the cap as "viscid greenish yellow"), 4-10cm across, yellow, disc often brownish; bald with occasional tufts of fibrils, "viscid when moist and fresh, soon dry", (Ovrebo)

Flesh:
white in cap and stem, (Shanks), firm; white, sometimes appearing water-soaked, (Ovrebo)

Gills:
sinuate to broadly sinuate, close, 0.2-0.8cm broad; white, (Shanks), sinuate to uncinate, close, many tiers of subgills; white, edges not discoloring; edges often eroded, (Ovrebo), "crowded, free or slightly adnexed, white", (Peck)

Stem:
3.5-9 x 0.7-1.9cm, equal or rarely subclavate [somewhat club-shaped] or obclavate [reverse club-shaped], the base rounded, stem solid; "white overall or occasionally very pale yellow in places"; silky fibrillose and with superficial fibrils projecting, often lightly pruinose or scabrous at top, (Shanks), 3-9cm x 1-2.5cm, solid, becoming hollow; white, sometimes yellowish in lower part; bald to appressed silky-fibrillose, (Ovrebo), silky-hairy, often with a slight bloom at top, (Phillips), 2.5-5.1cm long, 3 to 5 lines wide [the line being a vaguely defined unit between 0.21 and 0.23 mm], "equal, firm, glabrous, white", (Peck)

Odor:
farinaceous (Shanks, Ovrebo)

Taste:
farinaceous (Shanks, Ovrebo)

Microscopic spores:
spores 5.3-9.6 x 3.4-5.8 microns, (holotype 4.8-6.2 x 2.9-4.3 microns, Sierra Nevada specimens 6.2-9.6 x 3.4-5.8 microns), elliptic, smooth, inamyloid, colorless; basidia 4-spored, 26-36 x 5.3-7.2 microns, clavate; cheilocystidia rare to abundant, 19-29 x 6.7-9.5 microns, "filiform, cylindric, clavate, saccate, ventricose, or sphaeropedunculate", colorless, thin-walled, smooth; cap cuticle an ixocutis, hyphae 2.4-7.2 microns, colorless or with pinkish brown refractive contents, smooth or with colorless, flare-like encrustations; clamp connections absent, (Shanks), spores 5.3-6.8 x 3.8-4.5 microns, elliptic in face view, elliptic to bean-shaped in side view, smooth, inamyloid, colorless, with droplets; basidia 28.5-34 x 5.3-7.5 microns, clavate, colorless, with droplets; cystidia absent; clamp connections absent, (Ovrebo), spores 5.1 x 4.1 microns, broadly elliptic, (Peck)

Spore deposit:
white (Ovrebo)