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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. (06-01-25); revised.

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

Taxonomic Literature: Taxonomic notes: +ascocarp outer wall cells obscure, polygonal to rounded, ca. 8-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [202-203] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Asia-Temperate, Europe (very rare in northern Europe), and Northern America (USA, Md., Va.). Region(s): Siberia and Far Eastern Asia. Country or state(s): Denmark, Finland, United Kingdom, Sweden, Germany, Hungary, Poland, Switzerland (incl. Liechtenstein), France (excl. Corsica), Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia), Romania, Belarus, Baltic States (Estonia, Lithuania, Latvia), and Ukraine; Japan; Virginia (USA).

Ecology: Biotroph; phytopathogenic; growing on stems or leaves, amphigenous. Host or Phorophyte Taxonomy: Lythrum salicaria L.; Lythrum, Lythraceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, gregarious (mostly), .075-.145-(.16) mm in diam.. Margin: External filaments present; interlaced with each other or interwoven with surrounding mycelium (usually), mycelioid, straight, .5-2.5-(3) µm long, 3.5-8 µm in diameter, pigmented (brownish or yellowish, paler upwards), numerous, growing all across the lower half of the ascocarp, thin, not ramified, irregular (seldom), septate.

Asci: 3-10 asci per ascocarp, not stipitate or indistinctly stipitate, 40-90 µm long, 30-45 µm wide; dehiscence unitunicate.

Ascospores: c. 4 to c. 8 per ascus, spores 3-6 per ascus, ellipsoid or ovoid, 16-23 µm long, 10-14 µm wide; septa absent; wall thin, remaining hyaline, hyaline.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid; macroconidial, not branched, 29-33 µm long, 13-15 µm wide; aseptate.

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