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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. Synonyms: Erysiphe pisi var. buhrii (U. Braun) Ialongo; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Erysiphe buhrii U. Braun. Type: Erysiphe buhrii U. Braun.

Taxonomic Literature: Taxonomic notes: +conidiophores foot-cells relatively long, slender, cylindric, sometimes flexuous, followed by (1-)2(-3) shorter cells, about 15-50 µm long, rarely a single second cell of approximately the same length;+appressoria lobed;+ascocarp outer wall cells irregularly polygonal to rounded, obscure, ca. 10-20(-25) µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [219-220] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Africa, Asia-Temperate, Europe, and Northern America (USA, Mexico). Region(s): Northern Africa, Siberia, Middle Asia (+ Asia Minor), and Mongolia. Country or state(s): Finland, United Kingdom, Sweden, Austria, former Czechoslovakia (incl. Czech Republic & Slovacia), Germany, Hungary, Poland, Switzerland (incl. Liechtenstein), France (excl. Corsica), Portugal, Spain (incl. Andorra & Monaco), Greece, Romania, European Turkey, Former Yugoslavia [incl. Bosnia and Herzegovina, Croatia, Macedonia, Moldova, Serbia and Montenegro, Slovenia], and Ukraine; California (USA).

Ecology: Biotroph; phytopathogenic; growing on stems or leaves, amphigenous. Host or Phorophyte Taxonomy: Silene alba (Mill.) E. H. L. Krause; Silene, Caryophyllaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, in loose groups or gregarious, (.095)-.1-.14-(.17) mm in diam.. Margin: External filaments present (short); interwoven with surrounding mycelium (mostly), mycelioid, straight, .5-1-(2) µm long, (3)-4-8-(11) µm in diameter, hyaline or pigmented (later, faintly in the lower half, brown below or occasionally brown throughout), numerous, growing all across the lower half of the ascocarp, smooth or rough, thin, not ramified or ramified (frequently), irregular (branchings coral-like), septate.

Asci: (3)-4-10-(13) asci per ascocarp, not stipitate or indistinctly stipitate, (40)-50-80-(90) µm long, 25-45-(50) µm wide; dehiscence unitunicate.

Ascospores: 1–2 to c. 8 per ascus, spores (2)-3-5-(6) per ascus, subglobose, ellipsoid, or ovoid, (16)-18-26-(28) µm long, (8)-10-18 µm wide; septa absent; wall hyaline.

Conidiophores: Pseudoidium-type; not branched; basal cells (35)-40-75-(100) µm long, 6.5-8.5-(10) µm wide. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid (sometimes) or more or less cylindrical; macroconidial (slender), not branched, 30-50 µm long, 14-22.5 µm wide; aseptate.

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