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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. (06-04-05); revised.

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

Type Information: Basionym: Uncinula tulasnei Fuckel. Type: Uncinula tulasnei Fuckel.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells irregularly polygonal, ca. 8-15 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [443-444] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Asia-Temperate and Europe (nearly all). Region(s): Siberia, Far Eastern Asia, and China (and Central Asia). 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), Spain (incl. Andorra & Monaco), Bulgaria, Greece, 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; Japan.

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Acer platanoides L.; Acer, Aceraceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, (.125)-.14-.19 mm in diam.. Margin: External filaments present; uncinate or circinate (close), .3-.75 µm long, 6-11.5 µm in diameter, hyaline, numerous, 40-80 per mm², growing on the upper half of the ascocarp, stiff and straight, smooth or faintly rough, thick, not ramified or ramified, not branched (1 time (bifid); simple and branched appendages mixed, simple appendages dominant) or dichotomously branched, aseptate.

Asci: 4-20 asci per ascocarp, not stipitate or indistinctly stipitate, 60-80-(100) µm long, (30)-35-50-(55) µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores (6)-8 per ascus, subglobose, ellipsoid, or ovoid, 15-25-(30) µm long, 10-15 µm wide; septa absent.

Conidiophores: Euoidium-type; not branched. Conidium Formation: Conidiogenous cells in chains. Conidia: Ellipsoid, ovoid, doliiform, or cylindrical (often with angular outline); microconidial (conidia 7-11 x 6-9 µm) or macroconidial (shape variable, l/w ratio about 1.5 or less), not branched, 19-28 µm long, 13-18 µm wide; aseptate; with distintly visible fibrosin body fibrosin bodies.

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