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Page number:79 
Remarks (public):The species is recognized by its host, the large smooth basidiospores and the simple-septate hyphae. 
Description type:Non-original description 
Description:Aleurodiscus fennicus Laurila Fig. 30 Ann. Bot. Soc. Zool.-Bot. Fenn. Vanamo 10(4):11, 1939.
Basidiocarp discoid to effused, usually small, rarely more than 1 cm diam. and up to 0.5 mm thick, margin sharp and somewhat reflexed, narrow, white and finely tomentose, hymenophore smooth, pale grey to pale pink brown or isabelline, soft when young, firmer with age.
Hyphal system monomitic with intertangled, thin-walled and simple septate hyphae, 2-3.5 µm diam., in an open texture. Acanthophyses very abundant and very variable in shape and size, clavate to hyphoid, apically with numerous protuberances, in some cases with protuberances in the middle part while the apex is smooth, some more irregular and almost like dendrohyphidia. Gloeocystidia scattered, clavate and mostly with a slightly tapering apex or almost hyphoid in shape, faintly yellowish in KOH.
Dendrohyphidia few and there are transitions to slender acanthophyses. Basidia 60-70 x 10-12 µm with 4 large sterigmata, protoplasm distinctly refractive in phase-contrast (as are the basidiospores). Basidiospores ovoid, smooth, 15 -17 x 8-10 µm.
Substrata. On dry, quite thin (2-10 mm) branches of Picea sp.
Distribution. Circumpolar in the boreal coniferous zone, but evidently very rare. In Europe only known from Sweden and Finland, recorded from Siberia,
USA and Canada.

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