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Page number:947 
Remarks (internal):Like all species of the genus P. limitata is variable depending on age, growth rate a.s.o. but in the Nordic area there is generally no trouble in recognizing it already in the field. Younger and more rapidly growing fruitbodies are more light-coloured while mature specimens are dark, when wet blue-violaceous. Specimens on Syringa are as a rule lighter, more reddish, than the normal form on Fraxinus. The black margin is as a rule visible at least in specimens on Fraxinus. P. pilatiana Pouzar & Svrcek (Ceska mykol. 7 p. 180, 1953) is reported to be very close, e.g. by D. Reid (Revista biol. 1965 p. 146) who states "virtually indistinguishable except for having a narrower basal layer"). This is however, not the whole truth. P. pilatiana is closely adnate, lacks the dark margin of P. limitata, has smaller spores, and above all, a different hyphal texture. In P. limitata the subhymenial hyphae have thickened walls and are conglutinated into a vertically arranged pseudoparenchymatic tissue, while in P. pilatiana the walls are thinner and intertwined in a more irregular way. As far as we can see from the available material (Boidin 2897) it is not especially close to P. limitata. P. pilatiana is a southern, thermophilic species, growing on different deciduous hosts and is not found in N. Europe. P. limitata is much more close to P. rufomarginata, which except in the choice of substrate differs usually in the lighter, reddish colour and white margin of young specimens. 
Description type:Non-original description 
Description:Peniophora limitata (Fr.) Cooke, Grevillea 8 p. Fig. 475-76, 529b 2 I , 1 879. Thelephora limitata Fr., Elench. 1 p. 222, 1828. Peniophora fraxinea (Pers.) Lund. in Lund & Nannf., Fungi exs. suec., Fasc. I-II p. 29 n. 84, 1934.
Fruitbody resupinate, orbicular but soon confluent and covering the substrate, adnate but when old loosening from the margins, 0.1-0.5 mm thick; hymenium in young specimens smooth, continuous, greyish red, then becoming irregularly tuberculate and cracked in pieces, violaceous grey, when wet dark blue-grey, old sterile fruitbodies brown; mar-gin in most cases dark, blackish, in rapidly growing specimens sometimes lighter, in very rare cases almost white.
Hyphal system monomitic, young hyphae thinwalled, hyaline, old hyphae thickwalled, pigmented brown; clamps present; subiculum always present but varying m thickness, 50-150 µm, composed of densely united, more or less parallel hyphae; subhymenium of dense, vertical hyphae together with enclosed cystidia, becoming stratified, in thick specimens 5 lavers or sometimes more.
Cystidia numerous, thinwalled when first appearing in the hymenium, with more or less oily contents, then becoming thickwalled, in the apical part covered with a layer of encrustation and filled with a crystalline sub-stance, basal part becoming pigmented brown, in enclosed cystidia encrustation often dissolved; size of cystidia mostly 30-50 x 8-12 µm, but sometimes larger, reaching 75 x 15 µm. Basidia narrowly clavate, 40-55 µm long, in the apical part 6-8 µm wide, with 4 sterigmata and basal clamps; basidial walls may be slightly thickened in basal direction. Spores allantoid, 8-12 x 3-3.5 µm, thinwalled, smooth, hyaline, spore-print pale red.
Habitat. On dead branches, still attached to the tree or fallen to the ground as well as on smaller, fallen trunks, of Fraxinus and Syringa, reported also from Ligustrum (Oleaceae), further on Philadelphus (Hydrangeaceae). The biotope is the mixed, fertile deciduous forest of S. Scandinavia, and in hedges a.s.o. in parks and gardens.
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