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Description type:Latin diagnosis 
Description:Pirex Hjortst. & Ryv. gen. nov. Etymology: anagram of Irpex Fr. Gender: m. Fructificatio resupinata, effusa, in typo quasi 2-5 mm crassa; hymenium plus minus ceraceum, irregulariter obtuse dentatum vel subporoideum. Systema hyphale monomiticum, hyphis omnibus fibulatis; subiculum distinctum, tomentosum, fuscum; hyphis basilibus crassiusculis, ramosis, intertextis, brunneolis, hyphis ceteris plus minus hyalinis, leviter oleosis; cystidia absentia, in hymenio hyphae cystidioideae dispositae; basidia clavata, leviter constricta, 4 sterigmatibus; sporis ellipsoidibus vel anguste ellipsoidibus, tenuitunicatis, levibus (statura mediocris), neque amolyoidibus et cyanophilis neque dextrinoidibus.
Typus generis: Radulum concentricum Cooke & Ellis
 
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