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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. (06-02-22); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Erysiphe hyoscyami R. Y. Zheng & G. Q. Chen; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Erysiphe hyoscyami R. Y. Zheng & G. Q. Chen. Type: Erysiphe hyoscyami R. Y. Zheng & G. Q. Chen.

Taxonomic Literature: Taxonomic notes: +ascocarp outer wall cells irregularly shaped, ca. 8-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [241] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Asia-Temperate and Europe (nearly all). Region(s): Siberia, Middle Asia, and China. Country or state(s): Finland, Sweden, former Czechoslovakia (incl. Czech Republic & Slovacia), Germany, Hungary, Poland, Corsica (France), France (excl. Corsica), Bulgaria, 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), and Ukraine.

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Hyoscyamus niger L.; Hyoscyamus, Solanaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, not emerging (often, in the dense mycelial layer), gregarious, .08-.14 mm in diam.. Margin: External filaments present (usually shorter than the cleistothecial diam., often poorly developed, very short); interwoven with surrounding mycelium, mycelioid, straight, .25-1.5 µm long, (4)-6-10 µm in diameter, pigmented (brown, sometimes brown below and paler above), few or numerous, growing all across the lower half of the ascocarp, smooth or rough, thin, not ramified or ramified (rarely), not branched, septate.

Asci: 6-16 asci per ascocarp, distinctly stipitate, (50)-60-70-(80) µm long, (15)-25-35-(40) µm wide; dehiscence unitunicate.

Ascospores: 1–2 to c. 4 per ascus, spores 2-(3) per ascus, ellipsoid or ovoid, 18-22 µm long, 13-15 µm wide; septa absent.

Conidiophores: Euoidium-type; not branched. Conidium Formation: Conidiogenous cells in chains. Conidia: Ellipsoid, doliiform, or cylindrical; macroconidial, not branched, 20-35 µm long, 14-19 µm wide; aseptate.

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