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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. (06-03-28); revised.

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

Type Information: Basionym: Erysiphe thesii L. Junell. Type: Erysiphe thesii L. Junell.

Taxonomic Literature: Taxonomic notes: +conidiophores foot-cells cylindric, followed by shorter cells;+appressoria lobed;+ascocarp outer wall cells obscure, irregularly polygonal to rounded, ca. 6-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [197-198] (1987); Braun, U. The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Africa (?), Asia-Temperate, and Europe. Region(s): Siberia and Far Eastern Asia. Country or state(s): Sweden, Austria, former Czechoslovakia (incl. Czech Republic & Slovacia), Germany, Hungary, Poland, Switzerland (incl. Liechtenstein), France (excl. Corsica), Bulgaria, Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia), Romania, Belarus, Baltic States (Estonia, Lithuania, Latvia), and Ukraine; Morocco; Japan.

Ecology: Biotroph; phytopathogenic; growing on stems, leaves, inflorescences, or fruits, amphigenous (mycelium often covering the entire surface of the leaves). Host or Phorophyte Taxonomy: Thesium humile Vahl; Thesium, Santalaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, in loose groups or gregarious, (.075)-.09-.12-(.125) mm in diam.. Margin: External filaments present (rather coarse, straight); straight, 1-4 µm long, 5-10 µm in diameter, hyaline or pigmented (later, at least partly), few, growing all across the lower half of the ascocarp, stiff and straight (rather coarse), thin, not ramified, septate.

Asci: 3-10 asci per ascocarp, indistinctly stipitate, 60-80 µm long, 35-40 µm wide; dehiscence unitunicate.

Ascospores: c. 4 to c. 8 per ascus, spores 3-6 per ascus, ellipsoid or ovoid, 20-23 µm long, 11-15 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched; basal cells 25-35 µm long, 8-9 µm wide. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid or doliiform; macroconidial, not branched, 26-45 µm long, 12.5-19 µm wide; aseptate.

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