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Page number:119 
Description type:Non-original description 
Description:Aleurodiscus penicillatus Burt Fig. 54 Ann. Mo. Bot. Gard. 5: 201, 1918.
Basidiocarp corticioid, first in small, separate patches 2-3 mm diam., up to 0.4 mm thick, later more confluent, forming irregularly effused areas, margin determinate, adnate, hymenophore pruinose to pulverulent, first smooth, later finely rimose, white to cream.
Hyphal system monomitic, hyphae with clamps, 3-6 µm wide, thin-walled. Acanthophyses hyphoid to broadly clavate, 20-100 x 5-20 µm, thick-walled, protuberances restricted to rounded apical part in the clavate acanthophyses, in the hyphoid ones also laterally in a length of up to 20 µm; transitions between the two types occur. Gloeocystidia cylindric to clavate or moniliform, (35)50-75 x 9-12 µm, often mammillate. Basidia clavate, 55-90(110) x 16-24 µm, difficult to observe properly in dry specimens, reported to have scattered lateral protuberances, with 4 sterigmata. Basidiospores ovoid-ellipsoid, 15-20 (25) x 13-17 µm, thick-walled at maturity, densely warted.
Cultural characteristics. See Boidin et al. (1968).
Substrata. On dead branches of conifers such as Abies, Picea, Pinus, Pseudotsuga, Thuja, and Tsuga.
Distribution. Southern Canada, USA, eastern Russia, Japan, and Taiwan. Remarks. The species seems to be related to A. spiniger sharing the same microstructure except for the basidiospores which are larger.
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