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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. (06-05-16); revised.

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

Taxonomic Literature: Taxonomic notes: +ascocarp outer wall cells irregularly polygonal to rounded, 10-20 (-25) µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [161-162] (1987); Braun, U. The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Northern hemispheric. Continent: Asia-Temperate and Europe. Region(s): Far Eastern Asia. Country or state(s): Switzerland (incl. Liechtenstein), France (excl. Corsica), Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia), Romania, Baltic States (Estonia, Lithuania, Latvia) (Estonia), and Ukraine; Kazakhstan and Transcaucasus (Armenia, Azerbaijan & Georgia).

Ecology: Biotroph; phytopathogenic; growing on leaves, hypophyllous. Host or Phorophyte Taxonomy: Salix alba L.; Salix, Salicaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered, .075-.1 mm in diam.. Margin: External filaments present (fasciculate); interlaced with each other (loosely), later recurved or straight, 6-12 µm long, 3.5-8 µm in diameter, hyaline or pigmented (yellowish to pale brown below, hyaline above), few or numerous, 5-12 per mm², growing on the upper half of the ascocarp, flexuose, smooth or faintly rough (near the base), thin (thoughout or somewhat thicker towards the base), not ramified, not branched or dichotomously branched (primary and secondary branches usually distinctly recurved, tips at first straight, later recurved), septate.

Asci: 1 asci per ascocarp, sub-globose, not stipitate, 65-85 µm long, 60-80 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 8 per ascus, ellipsoid or ovoid, 20-34 µm long, 12-19 µm wide; septa absent.

Conidiophores: Euoidium-type; not branched. Conidium Formation: Conidiogenous cells in chains. Conidia: Ellipsoid; macroconidial, not branched, 21-36 µm long, 12-18 µm wide; aseptate; with distintly visible fibrosin body fibrosin bodies.

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