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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. Data set reviewer(s): Schubert K. (06-03-29); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: variety. Synonyms: Golovinomyces mayorii (S. Blumer) V. P. Gelyuta var. mayorii; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Erysiphe mayorii S. Blumer var. mayorii. Type: Erysiphe mayorii S. Blumer var. mayorii.

Taxonomic Literature: Taxonomic notes: +ascocarp outer wall cells obcscure, irregularly polygonal to rounded, ca. 8-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [179-181] (1987); Braun, U. The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Asia-Temperate (Central Asia) and Europe. Country or state(s): Denmark, Finland, Sweden, 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, Belarus, Baltic States (Estonia, Lithuania, Latvia), and Ukraine; Kazakhstan.

Ecology: Biotroph; phytopathogenic; growing on stems or leaves, amphigenous. Host or Phorophyte Taxonomy: Cirsium arvense L.; Cirsium, Compositae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, .085-.15 mm in diam.. Margin: External filaments present (usually shorter than the cleistothecial diam.); interwoven with surrounding mycelium, mycelioid, straight, 3.5-6.5 µm in diameter, hyaline (at first) or pigmented (later, yellowish to brown), numerous, growing at the ascocarp base, smooth or rough, thin, not ramified or ramified, often irregular, septate; basal cell 3.5-6.5 µm long.

Asci: 6-30 asci per ascocarp, not stipitate (occasionally) or distinctly stipitate (mostly), 45-85 µm long, 20-40 µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores (5)-6-8 per ascus, subglobose, ellipsoid, or ovoid, (11)-15-22 µm long, (6)-8-14.5 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Doliiform or cylindrical; macroconidial, not branched, 23-35 µm long, (11)-14-21 µm wide; aseptate.

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