Category Archives: Volume 35 1995

Cortinarius testaceofolius sp. nova, a common Telamonia of the taiga

Authors: Lindström, Håkan & Soop, Karl
Journal: Karstenia, Volume 35 (1995), Issue 2, pages 91-95.
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Key words: Agaricales, Cortinarius, Telamonia, Picea mycorrhiza

Abstract:  Cortinarius testaceofolius H. Lindstr. & Soap, sp. nova is described from Sweden and Norway. The species is characterised principally by its conspicuous brick-red gills, and is associated with Picea abies, more rarely with Pinus sylvestris. It seems to be one of the most common members of subgen. Telamonia in oligotrophic spruce forests of the northern taiga region.

A new species of Wrightoporia (Basidiomycetes) from China

Authors: Dai, Yu-Cheng
Journal: Karstenia, Volume 35 (1995), Issue 2, pages 85-89.
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Key words: China, polypores, taxonomy, Wrightoporia

Abstract:  A new polypore, Wrightoporia rubella Y.C. Dai, is described from Beijing, China. It is easily distinguished from the other species of the genus by its strongly developed, vinaceous rhizomorphs, pale brown context, generative hyphae without clamp connections and somewhat larger spores than in the other species. The differences between it and related species are discussed.

Phellinus species on Betula. Mating tests, RFLP analysis of enzymatically amplified rDNA, and relations to Phellinus alni

Authors: Fischer, Michael & Binder, Manfred
Journal: Karstenia, Volume 35 (1995), Issue 2, pages 67-84.
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Key words: Betula, pairing tests, PCR, Phellinus, RFLP, speciation

Abstract:  Mainly based on collections from Fennoscandia, Estonia, and Central Europe, four species of the genus Phellinus Quél. (Hymenochaetaceae), all belonging to the P. igniarius (L. :Fr.) Quél. group, are shown to occur on Betula L. These species are P. nigricans (Fr.) P. Karsten, P. cinereus (Niemelä) Fischer, P. laevigatus (Fr. ex P. Karsten) Bourd. & Galz., and P. lundellii Niemelä. The occurrence of P. igniarius and P. alni (Bond.) Parm. on Betula remains in doubt. P. alni, P. nigricans, P. cinereus, P. laevigatus, and P. lundellii were characterized by pairing tests of single spore mycelia and RFLP (restriction fragment length polymorphism) data of enzymatically amplified ribosomal DNA. A unique RFLP phenotype was assignable to each species except P. nigricans, which was identical with P. alni. Distribution of the taxa is throughout the area under study; however, P. nigricans seems to be limited to Fennoscandia. Two stocks from North America pro ed to represent P. cinereus. Pairing relationships between P. nigricans, P. cinereus, and P. alni were examined in detail and were found to differ according to the geographic origin of the stocks. P. nigricans was positive in numerous pairings with P. alni from Fennoscandia, Estonia, and Central Europe. In addition, it is positive with P. cinereus from Fennoscandia, but negative with P. cinereus from Central Europe, Estonia, and the United States. P. laevigatus and P. lundellii were intersterile with all other taxa.

New boletoid fungi in the genus Leccinum from Fennoscandia

Authors: Korhonen, Mauri
Journal: Karstenia, Volume 35 (1995), Issue 2, pages 53-66.
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Key words: Boletes, Fennoscandia, Leccinum, taxonomy

Abstract:  Three new species in the genus Leccinum are described, viz. L. populinum M. Korhonen, L. cerinum M. Korhonen and L. palustre M. Korhonen. Their morphological characters, ecology and distribution in Fennoscandia are discussed. In addition, L. quercinum (Pilát) E.E.Green & Watl., L. aurantiacum (Bull.) Gay, L. versipelle (Fr.) Snell, and L. holopus (Rostk.) Watl. are redescribed with more exact characters, to facilitate comparison with the new species.

Community structure and dynamics of wood-rotting Basidiomycetes on decomposing conifer trunks in northern Finland

Authors: Renvall, Pertti
Journal: Karstenia, Volume 35 (1995), Issue 1, pages 1-51.
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Key words: brown rot, charred wood, community ecology, conservation, microclimate, Picea, Pinus, primeval forest, succession, threatened fungi, white rot, wood-rotting fungi

Abstract:  The succession and organization of wood-rotting Basidiomycetes, as indicated by their fruit body production, were studied on naturally fallen, decomposing trunks of Picea abies (L.) Karsten subsp. obovata (Ledeb.) Domin and Pinus sylvestris L. in northeastern Finland. The study area consists of northern boreal primeval forests that show no signs of forestry practices or wood utilization. Altogether 120 species of Basidiomycetes were found on Picea and 104 on Pinus. The species compositions varied with the following characteristics of the trunks: stage of decay, history of fungal infections preceding the tree fall, diameter and amount of bark. The structures of fungal communities were analysed by using DCA ordination and the divisive clustering technique TWINSPAN. The results indicate that wood-inhabiting fungi succeed each other according to a regular order and that they differ from each other in their association with microclimatic regimes, in their strategies in resource capture, in their competition ability during the wood decomposition, and in their species associates. Physical and chemical properties of the host tree species and the microclimate of the growth site govern the basic trends in the community development of wood-inhabiting fungi. The first steps in tree trunk decomposition greatly depend on the way the tree died. Primary decayers affect the composition of the fungi at later stages of decay, by opening successional pathways for specific groups of saprotrophs. It is concluded that the conservation of Lignicolous fungi can succeed only after comprehensive analysis of fungal community development and the achievement of a thorough understanding of the decomposition dynamics of fallen tree trunks.