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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 or basionymous. Taxonomic rank: species. Synonyms: Sphaerotheca helianthemi L. Junell; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells large, irregularly shaped, thick-walled,

conspicuous, ca. (10-)20-40 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [140] (1987); Braun U., The powdery mildews (Erysiphales) of Europe.- 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Europe. Country or state(s): Finland, United Kingdom, Iceland, Sweden, former Czechoslovakia (incl. Czech Republic & Slovacia), Germany, Poland, Switzerland (incl. Liechtenstein), Corsica (France), France (excl. Corsica), Spain (incl. Andorra & Monaco), Bulgaria, Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia), Romania, Baltic States (Estonia, Lithuania, Latvia), and Ukraine.

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

Reproduction Strategy: With sexual (and possible asexual) stages (often hypophyllous). Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, .07-.085 mm in diam.. Margin: External filaments present; mycelioid (coarse, about as long as the cleistothecial diam. or shorter), 1 µm long, 4-8 µm in diameter, pigmented (brown), few (less than 10), up to 10 per mm², growing all across the lower half of the ascocarp, smooth or faintly rough, thin, not ramified (mostly), septate.

Asci: 1 asci per ascocarp, sub-globose, not stipitate, 60-75 µm long, 50-65 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 6-8 per ascus, ellipsoid, cylindrical, or ovoid, 15-21 µm long, 10-16 µm wide; septa absent; wall thin, remaining hyaline, hyaline, not ornamented.

Conidiomata: Present (conidial state mostly scarcely developed); hyphomycetous.

Conidiophores: Oidium-type; not branched. Conidia: Ellipsoid, ovoid, or doliiform; macroconidial, not branched, 26-32 µm long, 13-18 µm wide; aseptate; with distintly visible fibrosin body fibrosin bodies.

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