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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-08-02). Data set reviewer(s): Schubert K. (06-04-05); revised (00-12-05).

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

Type Information: Basionym: Erysiphe roboris Gachet. Type: Erysiphe roboris Gachet.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells irregularly polygonal, obscure, ca. 8-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [590] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Asia-Temperate and Europe (rare, from Portugal and Spain to the European part of the USSR, seemingly absent in the northern parts of Europe). Region(s): China. Country or state(s): 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, 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), North-western Russia, and Ukraine; Japan and Korea (North & South).

Ecology: Biotroph; phytopathogenic; growing on leaves, hypophyllous (inconspicuous). Host or Phorophyte Taxonomy: Quercus robur L.; Quercus, Fagaceae.

Reproduction Strategy: With sexual (and possible asexual) stages (penicillate cells ca. 50-60 µm long). Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, .25-.35-(.4) mm in diam.. Margin: External filaments present (basal swellings large, ca. 50-65 µm diam.); not interlaced, straight, .8-1 µm long, numerous, 10-30 per mm², growing between the lower and upper hald of the ascocarp, stiff and straight, not ramified.

Asci: 15-40 asci per ascocarp, distinctly stipitate, 70-95-(110) µm long, 25-45 µm wide; dehiscence unitunicate.

Ascospores: 1–2 per ascus, spores 2 per ascus, ellipsoid or ovoid, 24-40-(50) µm long, 18-24 µm wide; septa absent.

Conidiophores: Ovulariopsis-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: More or less clavate; macroconidial, not branched, 60-80 µm long, 15-25 µm wide; aseptate.

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