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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (03-01-21). Data set not revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Erysiphaceae Tul. & C. Tul.; Erysiphales.

Taxonomic Literature: Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Ecology: Growing on leaves, hypophyllous (rarely) or epiphyllous. Host or Phorophyte Taxonomy: Rosaceae.

Reproduction Strategy: With sexual (and possible asexual) stages (epiphyllous or hypophyllous). Ascocarps: Cleistothecioid, scattered or gregarious, .11-.2 mm in diam.. Margin: External filaments present (fragile, straight, rigid, rarely curved, 100-120 µm long); uncinate or circinate (narrow), hyaline, numerous, 150-200 per mm², thin, aseptate.

Asci: 10-20 asci per ascocarp, not stipitate or indistinctly stipitate, 70-90 µm long, 40-50 µm wide; dehiscence unitunicate.

Ascospores: 1–2 to c. 4 per ascus, spores 3-5 per ascus, broadly ellipsoid or ovoid, 20-25 µm long, 10-15 µm wide.

Conidium Formation: Conidiogenous cells single. Conidia: Ovoid (oblong-); 15-30 µm long, 10-20 µm wide; cell wall hyaline.

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