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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (02-09-25). Data set reviewer(s): Schubert K. (06-01-12); revised.

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

Type Information: Basionym: Leveillula lactucarum Durrieu & Rostam. Type: Leveillula lactucarum Durrieu & Rostam.

Taxonomic Literature: Taxonomic notes: +primary conidia, subcylindric, the sides are parallel with each other, base rounded or truncate, but narrowed or pointed towards the apex, surface (SEM) with a net of irregular ridges and warts, secondary conidia more or less cylindrical. Braun U., Beih. Nova Hedwigia 89: 1-700 [562] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Africa, Asia-Temperate, Europe, and Asia-Tropical. Region(s): Northern Africa (seemingly on additional host genera). Country or state(s): former Czechoslovakia (incl. Czech Republic & Slovacia), Germany, Hungary, France (excl. Corsica), Portugal, Spain (incl. Andorra & Monaco), Bulgaria, Greece, Romania, European Turkey, Former Yugoslavia [incl. Bosnia and Herzegovina, Croatia, Macedonia, Moldova, Serbia and Montenegro, Slovenia], North-western Russia, and Ukraine.

Ecology: Biotroph; phytopathogenic; growing on stems or leaves. Host or Phorophyte Taxonomy: Lactuca viminea J. Presl & C. Presl; Lactuca, Compositae (exact host range still unknown).

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, not emerging (often in the dense mycelial felt), sub-scattered or gregarious, .175-.22 mm in diam.. Margin: External filaments present; interlaced with each other or interwoven with surrounding mycelium, mycelioid, straight, .2-.8-(1.5) µm long, 4-11 µm in diameter, hyaline or pigmented (light brown), numerous, growing all across the lower half of the ascocarp, smooth or rough, thin, not ramified or ramified, irregular, septate.

Ascospores: 1–2 per ascus, spores 2 per ascus, ellipsoid or ovoid, 25-35 µm long, 14-20 µm wide; septa absent.

Conidiophores: Oidiopsis-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Sub-cylindrical (primary conidia); macroconidial (dimorph; primary and secondary conidia), not branched, rounded at both ends (secondary conidia), 45-55 µm long, 11-17 µm wide; aseptate.

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