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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. (06-03-23); revised.

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

Type Information: Basionym: Erysiphe convolvuli DC. var. convolvuli. Type: Erysiphe convolvuli DC. var. convolvuli.

Taxonomic Literature: Taxonomic notes: +appressoria lobed;+conidiophores foot-cells cylindric, followed by 2 shorter cells or cells of about the same length;+ascocarp outer wall cells irregularly polygonal to rounded, ca. 10-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [221-223] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Africa, Asia-Temperate, Europe, Southern America (introduced), and Asia-Tropical. Region(s): Northern Africa, Siberia, Middle Asia, and China. Country or state(s): Corsica (France), France (excl. Corsica), Spain (incl. Andorra & Monaco), Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia), Romania, European Turkey, Ukraine, and Cyprus; Canary Islands (Spain) (and Balearic Is.); India and Pakistan.

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Convolvulus arvensis L.; Convolvulus, Convolvulaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, .09-.155 mm in diam.. Margin: External filaments present; mycelioid, straight, .5-5 µm long, 4-10 µm in diameter, hyaline or somewhat pigmented (in the basal half), numerous, growing all across the lower half of the ascocarp, smooth or faintly rough, thin, not ramified or ramified, not branched or sub-dichotomously branched, septate.

Asci: 3-10 asci per ascocarp, not stipitate or indistinctly stipitate, 45-75 µm long, 30-45 µm wide; dehiscence unitunicate.

Ascospores: 1–2, c. 4, or c. 8 per ascus, spores (2)-3-4-(6) per ascus, ellipsoid or ovoid, 18-28 µm long, 11-18 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched; basal cells 25-36-(42) µm long, 7-10 µm wide. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid or cylindrical; macroconidial (germ tubes on an end, moderately long, simple, apex unlobed or slightly lobed), not branched, (25)-40-55-(65) µm long, 14-22 µm wide; aseptate.

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