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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-27). Data set reviewer(s): Schubert K. (06-03-27); revised.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Synonyms: Microsphaera syringae (Schwein.) Magnus; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Erysiphe syringae Schwein. Type: Erysiphe syringae Schwein.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells irregularly polygonal, ca. 8-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [433-434] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Asia-Temperate, Australasia, Europe (introduced), Northern America (USA, Canada, generally distributed, introduced in Australia), and Southern America (Argentina). Region(s): Siberia (introduced) and Australia. Country or state(s): Finland, United Kingdom, Austria, 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, Former Yugoslavia [incl. Bosnia and Herzegovina, Croatia, Macedonia, Moldova, Serbia and Montenegro, Slovenia], Belarus, Baltic States (Estonia, Lithuania, Latvia), and Ukraine; Washington (USA), Illinois (USA), Iowa (USA), Minnesota (USA), Missouri (USA), North Dakota (USA), Nebraska (USA), Oklahoma (USA), South Dakota (USA), Wisconsin (USA), Massachusetts (USA), Pennsylvania (USA), Nevada (USA), Florida (USA), Georgia (USA), Mississippi (USA), North Carolina (USA), and District of Columbia (USA). Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Syringa vulgaris L.; 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)-.08-.11-(.125) mm in diam.. Margin: External filaments present; circinate, sub-helicoid, or recurved (tips of the ultimate branchlets, also 2. and 3.), (.5)-1-1.5-(2) µm long, 7-11 µm in diameter, hyaline or faintly pigmented (at the base), few, 3-16 per mm², growing between the lower and upper hald of the ascocarp, stiff and straight (fairly), smooth (rarely) or rough, thin or thick (towards the base), ramified, dichotomously branched (3-5 times, primary branches often slightly elongated, branchings somewhat loose, tips of the ultimate branchlets recurved, mostly strongly recurved to subhelicoid or to nearly circinate), aseptate or septate (0-1-septate, rarely 2 septa).

Asci: 3-6 asci per ascocarp, sub-globose (often), not stipitate or indistinctly stipitate, 35-60 µm long, 25-45 µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores (3)-4-5-(7) per ascus, subglobose, ellipsoid, or ovoid, 15-25 µm long, 9-15 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid or doliiform; macroconidial, not branched, 25-35 µm long, 12.5-19 µm wide; aseptate.

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