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Page number:34 
Description type:Non-original description 
Description:Fructifications thin (0.05-0.2 mm), often rather smooth (esp. when growing on lignum) but generally more or less tuberculate; rounded but soon becoming irregularly confluent; firm to the consistency, esp. when dry; colour very variable, in wet weather dark blue-violaceous - blue-black, when dry greyish red to greyishviolaceous, sometimes greyish blue; almost always with an evident tinge of red (more red than P. cinerea); old specimens chocolate brown; margin determinate, often not especially differentiated, but just as often, distinct, white and faintly fibrillous, esp. when growing on Populus tremula.
Horizontal basal layer almost always totally lacking, but sometimes, esp. in young specimens, there is a thin horizontal layer; hyphae brown, densely united, with thickened walls; gloeocystidia present in varying numbers, clavate or fusoid, thin-walled, not incrusted, 7-10 µm wide, with droppy or resinous contents. They occur both in the hymenium and on different levels in the trama, sometimes few and then easily over-looked. Cystidia like those of P. cinerea but generally fewer; conical, apically incrusted and refractive, 15-30 x 5-8 µm; spores cylindrical, somewhat curved, 7.5-8.5 x 2.5-3 µm, hyaline but the spore print light red.
Type: Norway, Saltdalen, "in Alno" (est Salix! In the description the host is reported as being Salix caprea), CHR. SOMMERFELDT (Thelephora fallax var. violaceo-livida) in herb. Oslo; isotype in herb. Uppsala.
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