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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. Synonyms: Sphaerotheca thalictri L. Junell; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Taxonomic Literature: Taxonomic notes: +ascocarp outer wall cells large, conspicuous, irregularly shaped, ca. (10-)15-35 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [140-141] (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): Siberia. Country or state(s): Finland, Norway, Sweden, Germany, Switzerland (incl. Liechtenstein), France (excl. Corsica), and Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia); Kyrgyzstan (+ Central Asia and Armenia).

Ecology: Biotroph; phytopathogenic; growing on stems, leaves, or petioles, amphigenous. Host or Phorophyte Taxonomy: Thalictrum alpinum L.; Thalictrum, Ranunculaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, (.055)-.06-.07-(.075) mm in diam.. Margin: External filaments present; mycelioid, straight, .5-1.5 µm long, 4-9.5 µm in diameter, pigmented (brown throughout when mature, long appendages paler above), few (less than 10), up to 10 per mm², growing all across the lower half of the ascocarp, smooth or faintly rough, thin, not ramified or ramified (rarely), irregularly not branched, septate.

Asci: 1 asci per ascocarp, sub-globose, not stipitate, 50-65 µm long, 45-60 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 8 per ascus, ellipsoid or ovoid, 16-22-(24) µm long, 10-14.5 µm wide; septa absent.

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