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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. (06-03-27); revised.

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

Taxonomic Literature: Taxonomic notes: +conidiophores foot-cells cylindric, followed by two shorter cells, sometimes one cell of approximately the same length or longer;+appressoria lobed;+ascocarp outer wall cells irregularly polygonal, 6-20(-25) µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [200-201] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Cosmopolitan (nearly). Continent: Africa, Asia-Temperate, Europe, Northern America, Southern America (Argentina), and Asia-Tropical. Region(s): Siberia and China. Country or state(s): Denmark, Finland, United Kingdom, Norway, Sweden, Austria, Benelux (Belgium & Luxembourg), former Czechoslovakia (incl. Czech Republic & Slovacia), Germany, Hungary, Netherlands, Poland, Switzerland (incl. Liechtenstein), France (excl. Corsica), Portugal, Spain (incl. Andorra & Monaco), Bulgaria, Greece, Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia), Romania, European Turkey, Former Yugoslavia [incl. Bosnia and Herzegovina, Croatia, Macedonia, Moldova, Serbia and Montenegro, Slovenia], Belarus, Baltic States (Estonia, Lithuania, Latvia), and Ukraine; Mongolia (Mongolia), Japan, and Korea (North & South); India (and Ceylon); Idaho (USA), Montana (USA), Oregon (USA), Washington (USA), Wyoming (USA), North Dakota (USA), Oklahoma (USA), South Dakota (USA), Wisconsin (USA), Indiana (USA), New York (USA), Pennsylvania (USA), California (USA), Utah (USA), New Mexico (USA), Florida (USA), Georgia (USA), and Mississippi (USA). Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous (often covering the entire surface of the leaves). Host or Phorophyte Taxonomy: Polygonum aviculare L.; Polygonum, Polygonaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, .09-.14 mm in diam.. Margin: External filaments present; mycelioid, straight, (.25)-.5-1.5-(2) µm long, 4-10 µm in diameter, hyaline or pigmented (when mature, brown, sometimes brown below and paler upwards), numerous, growing all across the lower half of the ascocarp, thin, not ramified or ramified, irregular, septate.

Asci: 3-10 asci per ascocarp, not stipitate or indistinctly stipitate, 50-80 µm long, 30-45 µm wide; dehiscence unitunicate.

Ascospores: 1–2 to c. 8 per ascus, spores (2)-3-4-(5) per ascus, ellipsoid or ovoid, (18)-20-30 µm long, 10-15 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched; basal cells 30-42 µm long, 7-10 µm wide. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid or more or less cylindrical; macroconidial (length and width measured in fresh state, germ tubes at an end, short, ending in a lobed appressorium), not branched, 35-45 µm long, 13-19 µm wide; aseptate.

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