Authors: Nikulin, Marjo & Reijula, Kari & Stjernvall, Tuula & Hintikka, Eeva-Liisa
Journal: Karstenia, Volume 37 (1997), Issue 2, pages 57-64.
Doi: https://doi.org/10.29203/ka.1997.325
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Key words: electron microscopy, mycotoxins, Stachybotrys chartarum

Abstract: The fine structure of two Stachybotrys chartarum strains, one toxic (S. 72) and one non-toxic (S . 29) was investigated by transmission electron microscopy (TEM). It is not known if certain morphological details of the fungus are correlated with its toxin producingcapacity. The hyphae and conidia in both strains possessed three wall layers:an electron lucent inner layer, more dense middle layer, and an electron dense outer layer. The outer layer in both strains was uneven and formed an echinulate surface on the conidium. Only minor morphological differences were observed between the toxic and non-toxic strains. The echinulate surface of the conidium of the non-toxic strain was thinner than that in the toxic strain and the outer surface of the hyphae of the non-toxic strain was smoother than the hyphal surface of the toxic strain.

Authors: Vauras, Jukka
Journal: Karstenia, Volume 37 (1997), Issue 2, pages 35-56.
Doi: https://doi.org/10.29203/ka.1997.324
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Key words: Agaricales, Basidiomycetes, Fennoscandia, Inocybe argenteolutea, Inocybe decemgibbosa, Inocybe glabrodisca, Inocybe grammata, Inocybe pargasensis, taxonomy

Abstract: Two new species of Inocybe (Fr.) Fr., sect. Marginatae Kühner, are described from Finland, viz. I. argenteolutea Vauras and I. pargasensis Vauras, and I. decemgibbosa (Kühner) Vauras, comb. nov., is reported for the first time from the Nordic countries. I. grammata Quél. is a rather uncommon species in the study area, occurring from the temperate to the arctic zone. The distribution of these four species in Fennoscandia and adjacent areas is mapped, and their ecology and relationships are discussed. It is proposed that I. glabrodisca P.D. Orton should be classified as a member of section Cortinatae Kühner & Boursier.

Authors: Kullman, Bellis
Journal: Karstenia, Volume 37 (1997), Issue 1, pages 27-31.
Doi: https://doi.org/10.29203/ka.1997.323
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Key words: Ascomycetes, Finland, Pezizales, Octospora maireana, taxonomy, morphology, scanning electron microscopy

Abstract:  The first record of Octospora maireana (Seaver) Yei-Zeng Wang (Pezizales) from Europe outside the Mediterranean area is described and illustrated with drawings andwith micrographs obtained by optical and scanning electron microscopy. The world wide occurrence of this species is characterized. The morphological features of thespores and the fruitbody of O. maireana from Finland do not differ from those of the previously known five specimens found in North Africa, North America, Australia andSouth Europe.

Authors: Kurkela, Timo
Journal: Karstenia, Volume 37 (1997), Issue 1, pages 19-26.
Doi: https://doi.org/10.29203/ka.1997.322
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Key words: Neofabraea populi, Populus tremuloides, hybrid aspen, Populus x wettsteinii, Populus tremula x Populus tremuloides, spore dispersal, spore production, weather factors

Abstract:  Ascospore production and discharge by Neojabraea populi on hybrid aspen (Populus x wettsteinii) was studied during two summers in Finland. The main spore production began in July and continued until mid-October. High spore counts were obtained in connection with occasional rain showers from July to September. In the daily data,amount of precipitation, relative humidity, and daily maximum amount of dew correlated positively with the number of spores. Spore release was usually induced by rain,often with several hours delay, as was clearly seen in the short-term hourly variation in the number of spores.

Authors: Hæggström, Carl-Adam
Journal: Karstenia, Volume 37 (1997), Issue 1, pages 11-18.
Doi: https://doi.org/10.29203/ka.1997.321
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Key words: Åland Islands, checklist, Finland, Gasteromycetes

Abstract:  Both herbarium specimens and published data on the Gasteromycetes s.l. of the Åland Islands are treated. Altogether, 37 species have been reported which is a little more than half of the total species number of Finland. Seven species, namely Bovista nigrescens,B. plumbea, Calvatia excipuliformis, C. utriformis, Lycoperdon perlatum, L. pyriforme and Phallus impudicus seem to be common or fairly common in the Aland Islands. Eight species, viz. Geastrum elegans, G. floriforme, G. schmidelii, G. striatum, Langermannia gigantea, Lycoperdon echinatum, Melanogaster ambiguus and Tulostoma brumale are listed as threatened in Åland.

Authors: Calonge, Francisco D. & Härkönen, Marja & Saarimäki, Tiina & Mwasumbi, Leonard
Journal: Karstenia, Volume 37 (1997), Issue 1, pages 3-10.
Doi: https://doi.org/10.29203/ka.1997.320
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Key words: Africa, Gasteromycetes, mycology, Tanzania, taxonomy

Abstract:  Ten species of Gasteromycetes (Basidiomycotina) collected in Tanzania are described or mentioned in this article. Phallus tenuis (E. Fisch.) Kuntze seems to represent the first record for Africa.