Summary:
This fungus was found associated with fisheye rot of apples and was studied as isolated from the apples and grown on wood. Features are 1) a fruitbody spread over the woody substrate, with a surface that is white to cream (then aging to tan) and a waxy consistency, 2) sometimes a sweetly fruity odor, 3) spores that are elliptic to oblong, and when mature cyanophilic, 4) basidia that are 4-spored, long and evenly clavate, 5) context that is prosenchymatous with branching of hyphae more usually interseptal than from clamp connections, 6) thickened walls of subicular tissues and other elements, and 7) globoid crystalline masses found within the context.

Microscopic:
SPORES (4)4.5-6(7.5) x 2.5-3(3.5-4) microns, elliptic to oval to somewhat oblong, "basally slightly askew"; BASIDIA 4-spored, (16-20)30-45 x 3.5-5(5.5) microns, long and evenly clavate; hymenium homogeneous; CONTEXT prosenchymatous, branching of hyphae, at least initially, more usually interseptal than from the clamp cell, subhymenium and subiculum eventually (with increasing numbers of sprouting clamp connections) building up into a texture intricata to epidermoidea, eventually cyanophilic in wall of the firm to slightly thickened wall of spores "and thickened wall of subicular hyphae, sometimes as well in the thin wall of other hyphae and hymenial elements", "globoid crystalline masses within the prosenchymatous context" (on woody substrate), (Weresub)

Notes:
Butlerelfia eustacei has been found in BC, WA, OR, ID, IL, NY, and VA, (Ginns).

Synonyms and Alternate Names:
Fomes repandus Overh.
Phellinus repandus (Overh.) Gilb.