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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. Taxonomic rank: variety. Erysiphaceae Tul. & C. Tul.; Erysiphales.

Taxonomic Literature: Taxonomic notes: +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).

Biogeography: Continent: Asia-Temperate (Central Asia) and Europe (all). Country or state(s): Denmark, United Kingdom, Norway, Sweden, Austria, Benelux (Belgium & Luxembourg), former Czechoslovakia (incl. Czech Republic & Slovacia), Germany, Hungary, Netherlands, Poland, Switzerland (incl. Liechtenstein), France (excl. Corsica), Bulgaria, Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia), Romania, European Turkey, Former Yugoslavia [incl. Bosnia and Herzegovina, Croatia, Macedonia, Moldova, Serbia and Montenegro, Slovenia], and Ukraine; Kazakhstan, Kyrgyzstan, and Turkmenistan (and Armenia).

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, (.08)-.085-.125-(.15) mm in diam.. Margin: External filaments absent (width subequal throughout or somewhat increasing upwards, especially below the circinate part) or present; uncinate, circinate (rarely; fairly close, apex mostly somewhat enlarged), or sub-helicoid, 1-2 µm long, 4-6.5 µm in diameter, hyaline, (15)-20-30-(50) per mm², growing between the lower and upper hald of the ascocarp, flexuose (somewhat) or stiff and straight (rather), smooth or rough, thin or thick (towards the base), not ramified, aseptate.

Asci: (5)-10-15-(18) asci per ascocarp, not stipitate or indistinctly stipitate, (40)-45-60-(70) µm long, (20)-25-35-(40) µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores (4)-5-7-(8) per ascus, ellipsoid or ovoid, 13-20 µm long, 8-12 µm wide.

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