Summary:
Features include a cap that is whitish to yellowish or with orangish or pinkish or buff areas, a distinct stem, growth on the ground, inamyloid spores, and absent clamp connections. Colors overlap with Albatrellus ovinus and Albatrellus subrubescens and those species are reliably differentiated by their spores. The description is derived from Ginns(1) except where noted.
Albatrellus avellaneus is found in BC, WA, OR, CA, (Ginns).
Cap:
up to 10cm, becoming broadly convex to flat-depressed, margin incurved or wavy and uplifted; whitish to yellowish or with orangish or pinkish areas; dry and dull, smooth, appressed-tomentose to rather scurfy to slightly squamulose [with fine scales], when old some conspicuously roughened, developing some brown scaly areas or with tiny, pale brown fibrillose areas
Flesh:
up to 1cm thick; white; staining yellow when cut; white in stem
Pores:
tubes small, decurrent; white but when old yellowish, when bruised staining yellow to yellow orange or not staining
Stem:
5-9cm x 1-2cm, solid; white to pallid, soon stained rusty to ochraceous, yellow when old or spotted orange ferruginous, developing fuscous to brown colors at base of stem; roughened by decurrent tubes
Chemical Reactions:
flesh and tubes stain yellow in KOH; FeS04 on cap bluish black and on flesh fuscous gray
Taste:
none or disagreeable or somewhat bitter
Microscopic:
spores (4.6)5.0-5.6(5.8) x (3.4)3.6-4.2(4.4) microns, broadly elliptic, in side view often oval, some nearly round, smooth, inamyloid, walls mostly thickened to 0.5 microns; basidia 4-spored, 20-33 x 6.4-7.4 microns, cylindric-clavate; hyphae monomitic, clamp connections absent, hyphae of pileipellis repent, walls weakly to moderately amyloid, with inflations to 45 microns wide, colorless, hyphae of context (4)8-15(30) microns wide, infrequently branched, gloeoplerous hyphae scattered to common, hyphae of trama 3-5 microns wide, parallel to slightly woven, weakly amyloid, (Ginns(1)), cystidia none, (Gilbertson)
Spore Deposit:
white
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