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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. (06-03-29); revised.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Synonyms: Erysiphe verbasci (Jacz.) S. Blumer; Oidium balsamii Mont.; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Erysiphe cichoracearum f. verbasci Jacz. Type: Erysiphe cichoracearum f. verbasci Jacz.

Taxonomic Literature: Taxonomic notes: +conidiophores straight, foot-cells very long, width increasing from base to top, followed by 1-3 shorter cells;+appressoria nipple-shaped;+ascocarp outer wall cells obscure, irregularly shaped, ca. 8-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [266] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Northern hemispheric. Continent: Asia-Temperate, Europe, and Northern America (USA, Canada, introduced). Region(s): Siberia, Middle Asia, and China. Country or state(s): Denmark, Finland, United Kingdom, Norway, Sweden, Austria, former Czechoslovakia (incl. Czech Republic & Slovacia), Germany, Hungary, Netherlands, Poland, Switzerland (incl. Liechtenstein), Balearic Islands, France (excl. Corsica), Portugal, Spain (incl. Andorra & Monaco), Bulgaria, Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia), Romania, European Turkey, Former Yugoslavia [incl. Bosnia and Herzegovina, Croatia, Macedonia, Moldova, Serbia and Montenegro, Slovenia], Belarus, Baltic States (Estonia, Lithuania, Latvia), and Ukraine.

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous (well developed). Host or Phorophyte Taxonomy: Verbascum sp.; Verbascum, Scrophulariaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, in loose groups or gregarious, .095-.14 mm in diam.. Margin: External filaments present (shorter than the cleistothecial diam., sometimes rudimentary); not interlaced, mycelioid, straight, 3.5-7.5 µm in diameter, hyaline or pigmented (yellowish or brown), few or numerous, growing all across the lower half of the ascocarp, smooth, thin, not ramified or ramified (rarely), septate.

Asci: 8-20 asci per ascocarp, indistinctly stipitate, 50-80 µm long, 25-40 µm wide; dehiscence unitunicate.

Ascospores: 1–2 per ascus, spores 2 per ascus, ellipsoid or ovoid, 19-30 µm long, 11-18 µm wide; septa absent.

Conidiophores: Euoidium-type; not branched; basal cells 90-150 µm long, 10-15 µm wide. Conidium Formation: Conidiogenous cells in chains. Conidia: Ovoid, doliiform, or citriform; macroconidial (l/w ratio below 2, germ tubes at an end or side of the conidium, long and narrow, apex without appressorium), not branched, 30-45-(60) µm long, 19-28-(30) µm wide; aseptate.

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