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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. Data set revised.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Synonyms: Sphaerotheca delphinii (Karst.) S. Blumer; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Taxonomic Literature: Taxonomic notes: +ascoc. outer wall cells large, irregularly polygonal, 15-40 µm

diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [138] (1987); Braun U., The powdery mildews (Erysiphales) of Europe.- 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Asia-Temperate, Europe, and Northern America (USA). Region(s): Far Eastern Asia. Country or state(s): Finland, Poland, France (excl. Corsica), Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia), Belarus, Baltic States (Estonia, Lithuania, Latvia), and Ukraine; Northern Russia.

Ecology: Biotroph; phytopathogenic; growing on stems or leaves, amphigenous. Host or Phorophyte Taxonomy: Ranunculaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, in loose groups (mostly), .065-.085 mm in diam.. Margin: External filaments present (rather coarse, width variable, irregular); 1-4 µm long, 4.5-10.5 µm in diameter, pigmented (brown when mature), few (less than 10), up to 10 per mm², growing all across the lower half of the ascocarp, smooth or rough, thin, not ramified, septate.

Asci: 1 asci per ascocarp, 60-75 µm long, 50-60 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 6-8 per ascus, ellipsoid or ovoid, 19-31 µm long, 13-17 µm wide; septa absent; wall thin, remaining hyaline, hyaline, not ornamented.

Conidiophores: Oidium-type; not branched. Conidium Formation: Conidiogenous cells in chains. Conidia: Macroconidial, not branched, 30-35 µm long, 15 µm wide; aseptate; with distintly visible fibrosin body fibrosin bodies.

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