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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-26). Data set reviewer(s): Schubert K. (06-01-26); not revised (00-08-07).

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

Type Information: Basionym: Microsphaera syringae-japonicae U. Braun. Type: Microsphaera syringae-japonicae U. Braun.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells polygonal to rounded, 8-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [382-383] (1987).

Biogeography: Continent: Asia-Temperate and Europe (introduced). Region(s): Far Eastern Asia. Country or state(s): Germany, Poland, Switzerland (incl. Liechtenstein), and North-western Russia; Japan.

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Syringa reticulata (Blume) H. Hara; Syringa, Oleaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, (.065)-.07-.115-(.135) mm in diam.. Margin: External filaments present; setiform, recurved (tips of the ultimate branchlets), .75-1.25 µm long, 6-8 µm in diameter, pigmented (basal part, brown a the base, colour - although becoming faint - reaching the middle of the stalk, sometimes reaching the upper half, sometimes uniformly brown form the middle downward), few or numerous, 4-15 per mm², growing between the lower and upper hald of the ascocarp, stiff and straight, smooth or rough, moderatly thick (mostly throughout, sometimes thin-walled below [above ?] and thick-walled towards the base), ramified, dichotomously branched ((3-)4-5(-6) times, branchings close and regular, occasionally looser, primary and secondary branches elongated, occasionally deeply cleft, tips recurved), aseptate or septate (a single septum at the base).

Asci: 3-10 asci per ascocarp, not stipitate or indistinctly stipitate, 35-65 µm long, 30-45 µm wide; dehiscence unitunicate.

Ascospores: c. 4 to c. 8 per ascus, spores (5)-6-8 per ascus, subglobose, ellipsoid, or ovoid, (12)-14-23 µm long, 9-14 µm wide; septa absent.

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