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

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

Taxonomic Literature: Taxonomic notes: +conidiophores erect, straight, 4-8-septate, foot-cells followed by
shorter cells of about 30-40 µm in length;. Braun U., Beih. Nova Hedwigia 89: 1-700 [266-267] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Asia-Temperate (Central Asia), Australasia, and Europe. Region(s): New Zealand (introduced). Country or state(s): Sweden, Germany, Poland, Switzerland (incl. Liechtenstein), France (excl. Corsica), Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia), Romania, and Ukraine.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, .165-.21 mm in diam.. Margin: External filaments present; hyaline, growing all across the lower half of the ascocarp, not ramified, septate.

Asci: Distinctly stipitate, 82-100 µm long, 33-40 µm wide; dehiscence unitunicate (numerous).

Ascospores: 1–2 per ascus, spores 2 per ascus, ellipsoid, 20-23 µm long, 16-18 µm wide; septa absent; wall thin, remaining hyaline, hyaline, not ornamented.

Conidiophores: Oidium-type; not branched; basal cells 150-250 µm long, 10-15 µm wide. Conidium Formation: Conidiogenous cells in chains. Conidia: Ellipsoid, cylindrical, or ovoid; macroconidial, not branched, (35)-40-45-(71) µm long, (17.5)-20-22-(25) µm wide; aseptate; without distinct fibrosin body fibrosin bodies.

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