The microscopic characters which delimit A. erebia in Europe are: - Basidiospores 9-13(-15) x (5-)6-7 µm, elongate elliptic in face-view, slightly boletoid in side-view, ochraceous in water and alkali; germ-pore absent. Basidia 2-spored, cylindric-clavate, hyaline. Cheilocystidia variable, vesiculose to ventricose even clavate, 30-60 x 8-25 µm, hyaline; pleurocystidia few to numerous, lageniform, 50-80 x 12-16 µm. apex obtuse, (4-) 6-9 µm broad, hyaline often granular punctate. Pileipellis a palisadoderm of balloon-shaped to pyriform cells 9-15 µm broad. Stipitipellis of filamentous hyphae supporting at stipe-apex sterile cells similar to the cheilocystidia. Clamp-connections apparently absent.