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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-28). Data set reviewer(s): Schubert K. (06-03-02); revised.

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

Type Information: Basionym: Uncinula pyrenaica Vienn.-Bourg. Type: Uncinula pyrenaica Vienn.-Bourg.

Taxonomic Literature: Taxonomic notes: +conidiophores foot-cells increasing in width from base to top, followed by two shorter cells;. Braun U., Beih. Nova Hedwigia 89: 1-700 [502] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Northern hemispheric. Continent: Europe. Country or state(s): France (excl. Corsica) (only known from the type collection).

Ecology: Biotroph; phytopathogenic. Host or Phorophyte Taxonomy: Quercus ilex L.; Quercus, Fagaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered, .094-.114 mm in diam.. Margin: External filaments present (ca. 80-120 x 4 µm, width increasing upwards, apical part conspicuously enlarged); uncinate or circinate (fairly close), 1 µm long, 4 µm in diameter, hyaline, few or numerous, 9-20 per mm², growing between the lower and upper hald of the ascocarp, rough, thin or thick (towards the base), not ramified, aseptate.

Ascospores: 1–2 to c. 4 per ascus, spores 2-5 per ascus, 23-34 µm long, 15-20 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid or cylindrical; macroconidial, not branched, 26-40 µm long, 13-21 µm wide; aseptate.

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