New species, new records and first sequence data of powdery mildews (Erysiphaceae) from Europe with special emphasis on Switzerland

New records of powdery mildews (Erysiphaceae) from Switzerland and adjacent countries are listed and annotated, including first records of multiple host plants worldwide. The collections concerned are described, illustrated, discussed, and some identifications have been confirmed by results of sequencing (ITS + 28S rDNA). The new species, Erysiphe abeliana (on Abelia ×grandiflora) and Phyllactinia cruchetii (on Passiflora coerulea), are described. Some previous records of powdery mildews from Switzerland based only on morphology have been confirmed by sequence data. Type specimens of Erysiphe chifengensis and E. potentillae have been sequenced, and new sequences have been generated from collections of E. malvae and E. punicae. Microsphaera abeliae ( Erysiphe abeliicola) is epitypified with an ex-epitype sequence.