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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. Data set reviewer(s): Schubert K. (06-03-23); revised.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Synonyms: Microsphaera euonymi (DC.) Sacc.; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Taxonomic Literature: Taxonomic notes: +ascocarp outer wall cells irregularly polygonal, 10-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [307] (1987); Braun U. The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Asia-Temperate (Central Asia) and Europe. 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), 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; Turkey (excl. European Turkey).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Euonymus europaeus L.; Euonymus, Celastraceae.

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-.115 mm in diam.. Margin: External filaments present; straight, 2-7 µm long, 4-7.5 µm in diameter, hyaline or pigmented (rarely faintly brown below), numerous, 5-20 per mm², growing between the lower and upper hald of the ascocarp, flexuose (with a tendency to turn towards one direction), smooth, thin or thick (towards the base), ramified, dichotomously branched (1-6 times, branchings lax, diffuse, often deeply cleft, tips not recurved, straight), aseptate.

Asci: (4)-5-10-(12) asci per ascocarp, not stipitate or indistinctly stipitate, 40-60 µm long, 30-40 µm wide; dehiscence unitunicate.

Ascospores: c. 4 per ascus, spores 3-4-(5) per ascus, ellipsoid or ovoid, 18-27 µm long, 10-15 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid or cylindrical (oblong); macroconidial, not branched, 28-38 µm long, 15-18 µm wide; aseptate.

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