Authors: Pyykkö, Maire & Hämet-Ahti, Leena
Journal: Karstenia, Volume 20 (1980), Issue 1, pages 28-32.
Doi: https://doi.org/10.29203/ka.1980.194
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Abstract:  Sclerotinia pirolae Grosse (Ascomycetes: Helotiales), an ovaricolous, sclerotiaforming fungus, is reported as new to Finland on Pyrola chlorantha Swartz, P. media Swartz, P. minor L., P. minor x norvegica, P. minor x rotundifolia, P. norvegica
Knaben and P. rotundifolia L. It has also been found on P. minor x norvegica and P. norvegica from the adjacent Soviet Karelia. No ascocarps were discovered, but its sclerotial morphology suggests that the species probably belongs to the genus Monilinia Honey. The sclerotial stroma includes suscept tissues of the host and is of the hollowspheroid type characteristic of Monilinia. The sclerotial ontogeny of the species is described and illustrated.

Authors: Korhonen, Kari
Journal: Karstenia, Volume 20 (1980), Issue 1, pages 23-27.
Doi: https://doi.org/10.29203/ka.1980.193
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Abstract:  In the laboratory diploid pure cultures of A. ostoyae Romagn. produce fruit bodies with clampless basidia, whereas the natural fruit bodies of this species have basidia with a basal clamp. In nature the basidia develop from dikaryotic subhymenial cells with haploid nuclei and two nuclei fuse in the basidium. In pure culture the basidia develop from uninucleate diploid cells and no fusion of nuclei takes place in the basidium. Reduction of genetic material in fruit body primordia apparently precedes the development of subhymenial hyphae in nature. Such reduction does not take place in pure culture.

Authors: Korhonen, Kari & Hintikka, Veikko
Journal: Karstenia, Volume 20 (1980), Issue 1, pages 19-22.
Doi: https://doi.org/10.29203/ka.1980.192
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Abstract: Methods are described for isolation of single spores, spore tetrads, and hyphal cells, and rapid inoculation of fungal cultures in mating experiments. The instruments used are simple and are made in the laboratory.

Authors: Ulvinen, Tauno
Journal: Karstenia, Volume 20 (1980), Issue 1, pages 16-18.
Doi: https://doi.org/10.29203/ka.1980.191
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Abstract: Urocystis carcinodes (Berk. & Curt.) Fisch. v. Waldh. was found on Actaea spicala L. in northern Finland. The taxonomy and distribution of the fungus are discussed. Without infection experiments it is hardly possible to decide whether the smut on Cimicijuga (U. carcinodes s. str.) and the smut on Actaea, referred to U. ferrarisiana (Ciferri) Zundel, are different species.

Authors: Niemelä, Tuomo
Journal: Karstenia, Volume 20 (1980), Issue 1, pages 1-15.
Doi: https://doi.org/10.29203/ka.1980.190
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Abstract: Descriptions are given of the two species of Pycnoporellus occurring in Fennoscandia, P. alboluteus (Ell. & Ev.) Kotl. & Pouz. and P. fulgens (Fr.) Donk. Their distributions in North Europe are mapped, and their world distributions reviewed. Their ecology, phenology, host relationships, and cultural and microscopical characters are discussed. Great variability exists in the microscopical characters of both species. P. alboluteus is very rare in North Europe, where it has been recorded from only two localities in northern Finland, on Picea abies and once on Alnus incana. P. fulgens is rare and south-eastern in distribution, being known from four Swedish localities and several localities in southern Finland and the adjacent U.S.S.R., mostly on Picea abies, but also on Pinus sylvestris, Populus tremula and Betula. Study of the types indicates that the names Irpex woronowii Bres. and Lenzites sepiaria var. dentifera Peck are synonymous with P. alboluteus, and that Ochroporus lithuanicus Byonski (type selected), Polyporus aurantiacus Peck and P. fibrillosus Karst. are synonymous with P. fulgens. The taxonomic position of the genus Pycnoporellus is discussed.