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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-28). Data set revised.

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

Taxonomic Literature: Taxonomic notes: This variety differs from var. prunastri by ascomata characters, see

below.
+ascomata outer wall cells obscure, irregularly polygonal
to rounded, ca. 8-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [492-494] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Rosaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, (80)-85-125-(150) mm in diam..

Asci: 12-15 asci per ascocarp, 50-61 µm long, 25-32 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 7-8 per ascus, ovoid, 10-18 µm long, 7-9 µm wide.

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