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Page number:97 
Description type:Non-original description 
Description:Aleurodiscus lividocoeruleus (P. Karst.) P.A. Lemke Fig. 40
Can. J. Bot. 42: 252, 1964. - Corticium lividocoeruleum P. Karst., Not. Soc. Fauna Fl. Fenn. Förh. 5: 370, 1868.
Basidiocarp corticioid, effused and without differentiated edge, adnate, when older somewhat loosened from the substrate, hymenophore smooth, dark blue to greyish blue, rarely almost black, often paler when dry or even yellowish with a bluish tinge or a few scattered bluish patches, young specimens are often weakly pigmented, consistency dense and firm.
Hyphal system monomitic with thin-walled, clamped hyphae, usually densely interwoven and fused to an almost pseudo-parenchymatic structure in which distinct hyphae may be difficult to demonstrate. Between the hyphae there are irregular grains of a dark blue pigment and Calcium oxalate crystals in varying degree. Acanthophyses numerous, 15-25 x 4-5 µm with short apical protuberances. Cystidia (pseudocystidia) numerous, often mammillate, 40-80 x 8-12, protoplasm granular. Basidia subclavate, 20-25 x 5 µm. with 4 sterigmata. Basidiospores subcylindrical, 7-8 x 3-4 µm, smooth.
Cultural characteristics. See Boidin et al. (1968) and Nakasone (1990). Sexuality. Bipolar, see Boidin et al. (1968).
Substrata. On coniferous wood (fallen trees, fencing, etc.), rarely on deciduous wood such as Salix spp., usually in open, sunny, dry localities.
Distribution. Throughout the boreal conifer-zone and locally common. Remarks. The species is easy to recognize because of the strong blue to greyish colour. The parasite Tremella subencephala Bandoni & Ginns is specific to A. lividocoeruleus, producing small, pustular to discoid, gelatinous outgrowths (Bandoni & Ginns 1993).

 
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