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Page number:1023 
Remarks (public):Being a common and widely distributed species, it is natural that Ph. sordida shows a considerable variation. In fact it is so manifold and diverse, that it has been necessary to make a careful study of it before we have dared to make the taxonomical arrangement following here. Our treatment of it as a single taxon does not mean that we are fully convinced that it is one, rather that we have not been able to find separating lines clear enough for another arrangement. The constant characteristic, keeping the taxon together, is the nature of the subicular hyphae, which are more or less thickwalled, branched at right angles and running in all directions, thus forming a well intertwined but open context. Clamps occur only rarely on the basal hyphae. The cystidia are very variable in shape, size and number, but are usually rather thinwalled, little encrusted and fewer than in e.g. Ph. velutina and Ph. laevis. The living fruitbody is, at least when young, light-coloured (whitish, creamish, often with a greenish tint) but changes with age, generally to sordid yellowish. After some years in the herbarium many specimens change dramaticly and may in extreme cases become orange-red like Peniophora incarnata. There are all degrees from pale yellow to this bright colour. Other specimens turn ochraceous,
very few remain whitish. The yellow or reddish specimens appear under the lens to have an amber-coloured encrustation on the cystidia, which immediately turns vinaceous red when touched with KOH. A drop of KOH on the hymenium gives a vinaceous patch. About one half of all specimens seen of Ph. sordida gave this reaction, the other half did not. The yellow encrustation is not crystalline, rather resinous, and floats into rounded drops when heated in lactic acid, while the hyaline encrustation is crystalline, as is confirmed in the polarizing microscope. These characters, easily seen, might give reason for a separation into two taxa, one with yellow to red fruitbodies with cystidia encrusted with an amber-coloured resinous matter, and one with white-ochraceous fruitbodies with hyaline, crystalline encrustation. Unfortunately there are all degrees of reaction to KOH and a number of specimens cannot be determined as belonging to either group. Further more, it has not been possible to use the shape, size, number, and encrustation of the cystidia as a basis for specific separation. We have found it inevitable to treat it as one species, including i.a. Corticium cremeuni, the type of which has a rather weak reaction to KOH, Grandiniella livescens, which shows no reaction at all and has cystidia with a thick encrustation and Corticium eichlerianum with long, sometimes branched cystidia. The type of Corticium sordidum is a rather aged specimen without reaction to KOH.
Ph. raduloides is closely related to Ph. sordida but in this case there seems to be no problem in separating the taxa. The thicker, more or less raduloid fruitbody and especially the nature of the subicular context with hyphal branches functioning as binding hyphae, make Ph. raduloides well characterized. Peniophora eichleriana sensu Bourdot & Galzin has similar hyphae and we therefore don't want to include it in Ph. sordida, but rather in Ph. raduloides. According to Rogers &
Jackson (Farlowia 1 p. 314, 1943) P. eichleriana sensu Bourd. & Galz. is a species of its own ("quite a different species"). Phanerochaete chrysosporium, another species with close relations to Ph. sordida, is separately discussed (p. 993).
Description type:Non-original description 
Description:Phanerochaete sordida (Karst.) Erikss. & Ryv. n. comb.; Corticium sordidum Karst., Medd. Soc. F.Fl. fenn 9 p. 65, 1882; Grandiniella livescens Karst., Hedw. 34 p. 8, 1895; Corticium cremeum Bres., Fungi trid. 2 p. 63, 1898; Corticium eichlerianum Bres., Ann. mycol. 1 p. 95, 1903. Non Peniophora eichleriana sensu Bourdot & Galzin, Hym. de France p. 306, 1928.
Fruitbody resupinate, adnate, 0.2-0.5 mm thick, not or only in small pieces detachable, mostly of moderate size (ab. 1 dm) but sometimes confluent into larger ones, as a rule smooth, at first whitish, then cream-coloured, often with a slight greenish tint, in the herbarium turning into pale ochraceous, sordid buff or vividly orange red; ceraceous when alive, firm membranaceous when dried; old herbarium specimens often with more or less cracked hymenium; margin varying, abrupt, indistinct or finely fimbriate under the lens, not conspicuously fibrillose and without rhizomorphs.
Hyphal system monomitic; hyphae without clamps, subhymenial ones thinwalled, richly branched into a dense texture, forming a thickening subhymenium; subicular hyphae, 5-7 µm wide, in young specimens with quite thin walls, later with more or less thickened walls, mostly very distinct, branched at right angles in all directions into an open context; hyphae next to the wood more parallel to the substrate.
Cystidia varying in shape and number, mostly cylindrical or fusiform, tapering to the apex which usually is obtuse; walls at first thin, more or less thickening but may in some cases remain thin; size of cystidia mostly 60-70 x 6-10 um, but may reach 120 µm or more; encrustation varying with age of the fruitbody and other factors, may be none at all but usually there are grains or crystals in the apical or middle part, in some specimens the cystidia are strongly encrusted; the encrusting matter is either hyaline crystals or yellow - red brown resinous matter, in the latter case turning red in KOH; rarely cystidia are provided with side branches which occur mostly in the apical part.
Basidia narrowly clavate, 25-30 x 4-5 µm, 4-spored, without basal clamp. The basidial layer is in one specimen found to be amyloid in Melzer's reagent.
Spores mostly 5-7 x 2.5-3 µm, some spores may be longer but in most specimens they are shorter than 6 µm, narrowly ellipsoid or subcylindrical, adaxial side almost straight, abaxial side more or less convex, walls thin, smooth, non-amyloid, non-cyanophilous.
Habitat. On decayed wood of all kinds (branches, trunks etc.) on deciduous trees and also even if not fully so often, on conifers,preferably Picea. It occurs in a variety of biotopes, from the mull-rich deciduous forest to coniferous forests of the humid Hylocomium-Vaccinium type. It does not seem to grow so well in the drier, poorer conifer forest
(the Cladonia-Empertrum-Calluna type).
Distribution. In all forested parts of N. Europe from Denmark to Finnmark and is one of the important wood-decaying fungi. It is widely distributed in the N. temperate zone and is probably one of the commonest corticioids.
Holotypus of Corticium sordidum: Fennia, Mustiala, ad lign. muc. pini, 1865.10.21, P.A. Karsten (herb. Karst. 1512 H).
Holotypus of Grandiniella livescens: Fennia, Mustiala, In ligno Tiliae, 1894.09.22, P.A. Karsten (herb. Karst. 808 H).
Holotypus of Corticium cremeum: In ramis Sorbi aucupariae. Bresadola Aug. (S).
Holotypus of Corticium eichlerianum: Ad ramos Quercus, Eichler (S).
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