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Page number:99 
Description type:Non-original description 
Description:Aleurodiscus macrocystidiatus P.A. Lemke Fig. 42 Can. J. Bot. 42: 255, 1964.
Basidiocarp corticioid, forming linear patches 0.5-3 cm long and 1-3(5) mm wide, margin determinate, adnate, hymenophore drying cream to ochraceous-buff.
Hyphal system monomitic, with thin- to thick-walled, simple-septate generative hyphae, up to 4.5 µm diam. Acanthophyses variable, basal portion cylindrical to clavate, walls thin to slightly thickened, aculeate portion borne laterally or at the apex, thick-walled to semisolid, 20-30 x 7.5-8 µm, occasionally branched. Gloeocystidia clavate to mammillate, 40-60(70) x (9)15-18(23) µm. Basidia 50-60 x 8-10 µm, with 4 sterigmata. Basidiospores ellipsoid to cylindric, 14-16 x 7-9 µm, rounded at both ends, smooth.
Substrata. On recently dead branches of Arbutus menziesii and Arctostapbylos sp.
Distribution. Canada (British Columbia) and USA (California).
Remarks. This species is closely related to A. diffisus, also found on Ericaceae, but has wider basidiospores and distinctly different pseudocystidia. The protuberances on the acanthophyses in the latter species are longer and more acicular.
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