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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-08-09). Data set reviewer(s): Schubert K. (06-01-26); revised.

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

Type Information: Basionym: Leveillula simonianii U. Braun. Type: Leveillula simonianii U. Braun.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells irregularly shaped, small, inconspicuous, ca. 8-15 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [565] (1987).

Biogeography: Continent: Asia-Temperate and Asia-Tropical. Country or state(s): Turkmenistan and Iran (and Central Asia).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous (mostly inconspicuous because of the dense tomentum of the host leaves). Host or Phorophyte Taxonomy: Thevenotia scabra Boiss.; Thevenotia, Compositae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, not emerging (in the dense tomentum of the leaves), scattered or gregarious, .15-.22 mm in diam.. Margin: External filaments present; mycelioid, straight, .2 µm long, 4-6-(8) µm in diameter, hyaline, few or numerous, growing all across the lower half of the ascocarp, rough, thin, not ramified or ramified (irregularly branched), irregular, aseptate or septate (few inconspicuous septa).

Asci: 20-25 asci per ascocarp, distinctly stipitate, 70-95 µm long, 30-40 µm wide; dehiscence unitunicate (very numerous).

Ascospores: 1–2 per ascus, spores 2 per ascus, ellipsoid or ovoid, 24-32 µm long, 14.4-21 µm wide; septa absent.

Conidiophores: Oidiopsis-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid or cylindrical (primary conidia more or less lanceolate, conidia densely covered by very conspicuous, large warts, strongly verrucose and squamulose); macroconidial (primary and secondary conidia), not branched, 35-50 µm long, 13-19 µm wide; aseptate.

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