The occurrence of arbuscular mycorrhizal fungi (AMF; Glomales, Zygomycetes) associated with plants growing in sand dune soils of the Blędowska Desert, Poland, was investigated in 1995-1997. A total of 134 mixtures of soils and roots were sampled. The mixtures represented 26 plant species in 14 families and one unrecognized plant. Spores of AMF were found in 118 soil-root mixtures. The AMF spore populations comprised 20 described species of the genera Acaulospora, Gigaspora, Glomus and Scutellospora, as well as two undescribed morphospecies of the genus Glomus. The AMF most frequently occurring in the field-collected soils were members of the genus Scutellospora The AMF spore populations comprised 20 described species in the genera Acaulospora, Gigaspora, Glomus and Scutellospora, as well as two undescribed morpho-species of the genus Glomus. The fungal species most frequently and numerously found was Scutellospora armeniaca. The fungi relatively frequently present also were A. rugosa, A. lacunosa, G. aggregatum, an undescribed Glomus 142 and Sc. dipurpurescens. The overall spore abundance of AMF averaged 69.1 and ranged from 0 to 837 in 100 g dry soil. The highest abundance of spores occurred among roots of the families Cupressaceae, followed by the Rosaceae, Asteraceae and Poaceae. Of the plant species investigated two and more times, most spores harboured Juniperus communis. The overall average species richness was 2.4 and ranged from 0 to 6 in 100 g dry soil. Of the plant species sampled at lest two times, the highest average species diversity was found in the root zone of Salix arenaria. The plant species that hosted the highest overall number of species of AMF was Festuca rubra. Trap pot cultures with soilroot mixtures collected in 1997 revealed 10 species of AMF that were not found in field soils sampled in the same year. This suggests that a great part of AMF of Błędowska Desert is represented by rarely or non-sporulating species
In the years 1996 - 1997, the occurrence of parasitic and saprotrophic fungi was investigated in Słowiński National Park. A total of 209 plant species belonging to 37 families were studied, from which 270 species of fungi were isolate. The fungi most numerously represented were members of the <i>Deuteromycotina</i>, which occurred in 36% of the samples investigated. The members of the <i>Basidiomycotina</i> were found in 23% of the samples. Of the fungi recovered, many were quite rarely recorded in Poland. <i>Schyzothyrioma ptarmicae</i> found to be associated hitherto with <i>Achillea ptarmica</i> is a species new to the communities of fungi of Poland.
A new ectocarpic arbuscular mycorrhizal fungal species, Glomus arenarium (Glomales, Zygomycetes), was recovered from maritime sand dunes of northern Poland. Glomus arenarium forms spores with a narrow and hyaline subtending hypha. Spores are orange to raw umber, globose to subglobose, (55-)97(-120) µm diam or ovoid, 65-105 x 95-140 µm. Their wall consists of three layers: a hyaline outermost layer present only in very young spores, a semiflexible, hyaline middle layer rarely present in mature spores, and a permanent, laminate, orange to raw umber innermost layer. No spore wall layers of G. arenarium reagent. This fungus formed spores and arbuscular mycorrhizae in single-species pot cultures with Plantago lanceolata
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