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Fungi within the phylum Glomeromycota were investigated in arable fields throughout Sweden. Sweden is located between 55° and 69° North. The fungi within this phylum form arbuscular mycorrhizal symbiosis with plant roots. Sampling of soil was carried out to a depth of 30 cm in the rhizosphere. Arbuscular mycorrhizal fungi were found at all 45 sampling sites, at densities between 3 and 44 spores per g dry weight of soil. No significant differences in spore densities were found between different agro-climatic zones or between semi-natural grassland and ploughed fields. Our study revealed that the upper half (0-15 cm) of the soil profiles had significantly more spores than the lower half (15-30 cm). Spores from eight sampling sites were identified from the indigenous soils. Almost 90% were shown to belong to the genus Glomus . The other genera found were Gigaspora and Scutellospora .