Basidiomycetes produce large quantities of spores that are dispersed by the wind over long distances. Some species can release billions of spores in a day, many of which are important aeroallergens associated with asthma and allergic rhinitis. The results of a survey carried out in the city of Seville during two consecutive years, using a Hirst-type spore trap, showed that airborne basidiospores are present throughout the year, although there is a certain seasonal distribution, with the highest average concentration occurring in November (23,586 basidiospores). Eighteen different types of basidiospores were identified, with Coprinus and Ustilago being the most frequent, followed in descending order of abundance by Agaricus, Phylacteria, Boletaceae, Ganoderma, Cortinarius, Calvatia, Agrocybe, Bovista and Puccinia; the remaining spore types comprised less than 1% of the total basidiospore count.
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