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

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Microsphaera euonymi-japonici; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera euonymi-japonici Vienn.-Bourg. Type: Microsphaera euonymi-japonici Vienn.-Bourg.

Taxonomic Literature: Taxonomic notes: +appressoria multilobed;+conidiophores foot-cells cylindric, straight or slightly flexuous, followed by two shorter cells;. Braun U., Beih. Nova Hedwigia 89: 1-700 [311-312] (1987); Braun U. The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Africa, Asia-Temperate, Australasia, Europe (wherever the host is planted), Northern America, Southern America, Pacific, and Asia-Tropical. Region(s): Northern Africa, Australia, and New Zealand. Country or state(s): Denmark, United Kingdom, Norway, Sweden, Austria, Benelux (Belgium & Luxembourg), former Czechoslovakia (incl. Czech Republic & Slovacia), Germany, Hungary, 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; New York (USA), Arizona (USA), California (USA), New Mexico (USA), Texas (USA), Louisiana (USA), and Mississippi (USA); Uruguay. Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on stems, leaves, or inflorescences. Host or Phorophyte Taxonomy: Euonymus japonicus Thunb.; Euonymus, Celastraceae.

Reproduction Strategy: With sexual (and possible asexual) stages (immersed in the dense mycelial layer). Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, not emerging (immersed in the dense mycelial layer), in loose groups, .1-.145 mm in diam.. Margin: External filaments present (240-430 µm long, narrow); straight, 240-430 µm long, hyaline, few, 10-14 per mm², flexuose, ramified, not branched (1-3 times, branchings loose, wide, diffuse, tips not recurved), aseptate or septate (0-3 septate).

Ascospores: 1–2 to c. 4 per ascus, spores 2-3 per ascus, 19-27 µm long, 12-16 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched; basal cells (10)-20-30-(50) µm long, 7.5-8.5 µm wide. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid or cylindrical; macroconidial (germ tubes at an end, short, terminating with a lobed appressorium), not branched, 24-40-(45) µm long, 12-18 µm wide; aseptate.

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