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Remarks (public):Cantharellus ianthinus is obviously closely related but differs in much smaller fruit-bodies and larger spores.
Cantharellus appalachiensis Petersen and C. tabernensis Feibelman & Cibula share some macro- and microscopic features with C. subamethysteus, but the cap of these American taxa is smooth to glabrous, and only flushed with brown at the disc, never with well-delimited purplish lilac squamules (Petersen and Ryvarden, 1971; Petersen, 1979a; Feibelman et al., 1996).
Cantharellus amethysteus (Quél.) Quél. is a much stouter species, with a cap up to 10 cm. The spores are also larger, measuring 9.5-11 — 6-7 µm (Eyssartier and Buyck, 2000).
 
Description type:Original description 
Description:Cap 20-65 mm, convex or plano-convex with depressed centre; colour deep and bright yellow (3A4-6), paler towards the margin sometimes up to 2A4-5, covered with purplish lilac squamules (15BCD3-5); older specimens with scales rather brown to dark brown with a purple tinge instead of clear purple. Hymenium paler yellow than upper surface (3A3-4). Stipe 42-57 — 5-11 mm concolorous with hymenium but darkening when handled (3A4-5). Context solid or slightly hollow (probably because of insect larvae). Smell agreeable, fruity, like apricots. Spores 7-8 (8.75) — (4.75) 5-6 µm, Q = 1.2-1.5, mean 7.6 — 5.6 µm, Q = 1.4. shortly ellipsoid, smooth. Hymenium distinctly accrescent. Basidia 44-75 — 9-10 µm, 4-5-6-spored, clavate. Subhymenium not differentiated. Suprapellis composed of repent hyphae with numerous and obtuse free extremities and often short and inflated elements, thin-walled, 8-15 µm width, coloured with yellowish intracellular and parietal pigment, smooth or sometimes incrusting on the slender hyphae, combined with a greyish or violaceous intracellular one on the squamules. Clamp-connections present. 
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