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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-08-02). Data set reviewer(s): Schubert K. (06-01-26); revised.

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

Taxonomic Literature: Taxonomic notes: +ascomata cells obscure, irregularly polygonal, ca. 8-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [582] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Africa, Asia-Temperate, Europe (all), and Northern America. Region(s): Northern Africa, Siberia, Far Eastern Asia, Middle Asia, and China. Country or state(s): Denmark, Finland, United Kingdom, Norway, Sweden, Austria, Benelux (Belgium & Luxembourg), former Czechoslovakia (incl. Czech Republic & Slovacia), Germany, Hungary, Netherlands, Poland, Switzerland (incl. Liechtenstein), France (excl. Corsica), Portugal, Spain (incl. Andorra & Monaco), 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], Belarus, Baltic States (Estonia, Lithuania, Latvia), and Ukraine; Japan, Korea (North & South), and Turkey (excl. European Turkey) (and Central Asia).

Ecology: Biotroph; phytopathogenic; growing on leaves, hypophyllous (mostly) or amphigenous. Host or Phorophyte Taxonomy: Fraxinus excelsior L.; Fraxinus, Oleaceae.

Reproduction Strategy: With sexual (and possible asexual) stages (hypophyllous). Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups (rarely), .15-.18-(.25) mm in diam.. Margin: External filaments present (bulbous base ca. 25-50 µm diam.;); mycelioid or setiform (bristle-like, neither mycelioid nor setiform), straight, 1-2 µm long, few or numerous, 6-15 per mm², growing between the lower and upper hald of the ascocarp, stiff and straight, not ramified, septate.

Asci: 10-25 asci per ascocarp, distinctly stipitate, 50-90 µm long, 25-45 µm wide; dehiscence unitunicate.

Ascospores: 1–2 to c. 4 per ascus, spores (2)-3-4 per ascus, ellipsoid or ovoid, 20-50 µm long, 15-25 µm wide; septa absent; wall hyaline or pale brown (yellowish).

Conidiophores: Ovulariopsis-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: More or less clavate; macroconidial, not branched, 50-100 µm long, 15-25 µm wide; aseptate.

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