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Language: French, with bilingual keys in English and French and multilingual summary in English, French, German, and Italian
This monograph is based on morphological and anatomical studies of herbarium material from the author’s own collections, made between 1954 and 2004 and preserved in the Conservatory and Botanical garden of the City of Geneva (G). Complete descriptions, with more than 125 original figures, are given for the species newly discovered in Switzerland and for the already known, but insufficiently described species. For the descriptions and illustrations of the well-known species, the reader is referred to the existing literature. A particular effort has been made to illustrate the anamorphic stages of the species. The number of powdery mildews species in Switzerland has increased from 75 to 122, representing 38.5 % more species than previously reported. A certain number of species were introduced after 1990, others were probably already in the country but never identified, or were incorrectly described. Three new species are proposed: Erysiphe caricae U.Braun & Bolay, Erysiphe scholzii U.Braun & Bolay and Erysiphe scholzii U.Braun & Bolay and Erysiphe scholzii Oidium vincae Bolay. Adoption of the new systematic concept based on molecular criteria resulted in a change of generic names of 60.7 % of the species known from Switzerland. The number of genera has increased from 8 to 10 and the species are divided among the following genera: Arthrocladiella (1 species), Blumeria (1), Erysiphe (60), Golovinomyces (12), Leveillula (2), Neoerysiphe (2), Oidium (9), Phyllactinia (5), Podosphaera (28) and Sawadaea (2). Keys based on morphological and anatomical characters, as well as on host specificity are proposed, in French and in English, allowing the identification of all the species of Erysiphaceae present in Switzerland. A list of host plants is presented for each species of the Erysiphaceae. More than 1340 host plants, belonging to 75 families have been reported in Switzerland. For each of these 75 plant families, an identification key to determine all the Erysiphaceae actually described on those plants is proposed. This monograph ends with an index of the genera of the host plants of Switzerland with a reference number for the associated Erysiphaceae, as well as an index of all the mentioned species of Erysiphaceae.