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Page number:103 
Remarks (public):A. arachnoidea is close to the A. epiphylla-complex and it is not definitely sure that it is distinguished from it, as it could be interpreted as an assemblage of 2-spored forms from this complex. Hyphae and basidiols are dikaryotic, after meiosis there are 4 nuclei in the basidium and the two spores receive two nuclei each. 
Description type:Non-original description 
Description:Athelia arachnoidea (Berk.) Jül., Willdenowia Beih. 7: 53, 1972; Corticium arachnoideum Berk., Ann. Mag. Nat. Hist. 13: 345, 1844.
Fruitbody thin and white, when fresh bluish white and pellicular.
Hyphal system, subhymenial hyphae 3-5 µm in diameter and without clamps, basal hyphae somewhat wider, with slightly thickened walls and with scattered clamps.
Basidia 20 µm 30 x 5-7 µm with normally 2 sterigmata, clamps absent at the base.
Spores narrowly ellipsoid to narrowly ovate, about 8 µm 10 x 4-5 µm.
Habitat. Predominantly on deciduous wood but also as a parasite on lichens. The sclerotium stage reported from such lichens seems in most cases to belong to this species. However, also other Athelia species (of the type with four sterigmata) seem able to attack lichens, and the problem with the sclerotia is apparently not yet finally solved. Sterile Athelia species are common on humid tree trunks in -towns and other polluted areas and apparently play a certain role in the disappearance of lichens from such areas.
Distribution. Quite common in Southern Sweden and Jülich reports even a few collections from Norrland (Jämtland, Gästrikland). Probably also common in the lower parts of Eastern Norway.
 
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