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Page number:1226 
Remarks (public):The easiest recognized of all Corticiaceae. Fries when he first described the species in Elenchus reported it as common (vulgaris) and also that he had seen living material. There is nothing left to prove that this is correct. In Monogr. Hym. Suec. 1863 he has changed the statement to "rarius" but without any locality mentioned: There is reason to believe that the species is never found in Sweden.
The Norwegian material appears to have smaller basidia and spores and shorter and fewer dendrohyphidial branches, but this is evidently a case of intraspecific variation.
Description type:Non-original description 
Description:Pulcherricium caeruleum (Fr.) Parm. Consp. Byst. Cort. p. 132, 1968. - Thelephora caerulea Fr., Elench. I p. 202, 1828.
Fruitbody resupinate, adnate but in older specimens loosening in the margins, orbicular and confluent and thus sometimes becoming quite large, ab. 0.2-0.5 mm thick, deep blue when alive and in good state, older specimens fading to greyish or brownish blue; hymenium soft-ceraceous, smooth or irregularly tuberculate, old specimens cracking in pieces; margin more or less fimbriate, concolorous or in the youngest state whitish.
Hyphal system monomitic; all hyphae with clamps, often also with adventitious septa, which may be frequent in some hyphae; branches as a rule from clamps; subbasidial hyphae thin-walled, 2-3 µm wide, subicular ones 4-5 µm, with thickened walls, the basal ones straight and with sparse ramifications, other hyphae much branched and interwoven; cell contents blueish, besides blue excreted matter between the hyphae, esp. in the subhymenial part of the tussue; walls hyaline or in the basal hyphae yellowish or brownish, which together with the blue contents makes them often look greenish.
Cystidia none.
Dendrohyphidia formed from basidial primordia from which irregularly branched dendrohyphidial hyphae appear; total length 25-40 µm. Intermediates between basidia and dendrohyphidia common, sometimes with both sterigmata and dendrohyphidial branches.
Basidia narrowly clavate, hyaline or light to dark blue, at maturity 35-45(-60) x 5-6(-8) µm, with 4 conical sterigmata and basal clamp; sometimes with lateral dendrohyphidial branches.
Spores ellipsoid, thin-walled, hyaline, 7-9(-11) x 4-6(-7) µm, non-amyloid, non-cyanophilous.
Habitat. On dead branches of deciduous trees, in Scandinavia found on Fraxinus, but in the southern part of its wide area of distribution on all sorts of deciduous wood and on dead stems of big herbs. The localities in W. Norway are very special, at the inner end of fiords, sheltered both from the coolness of the sea and from cold winds from inland, and thanks to the topographical situation with a larger number of sunshine hours and in this way getting higher temperatures both summer and winter.
Distribution. In Scandinavia very rare, known from only two areas, the Norwegian SW. coast in Hardanger and Ryfylke, where it has been collected several times now, and the island of Fyn in Denmark (latest collection 1882! ). It is rare in C. and W. Europe but more commonly distributed in S. Europe and evidently in all subtropical and tropical regions.
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