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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. (06-02-22); revised.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Synonyms: Erysiphe depressa (Wallr.) Schltdl.; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Alphitomorpha depressa Wallr. Type: Alphitomorpha depressa Wallr.

Taxonomic Literature: Taxonomic notes: +conidiophores erect, foot-cells straight, width increasing from base to top, followed by 0-3 shorter cells, occasionally a shorter foot-cell followed by a very long second cell and 0-2 shorter cells;+appressoria nipple-shaped;+ascomata outer wall cells obscure, irregularly shaped, ca. 8-25(-30) µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [264-265] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Africa, Asia-Temperate, Europe, and Northern America (USA, Canada). Region(s): Siberia, Middle Asia, and China. Country or state(s): Denmark, Finland, United Kingdom, Norway, Sweden, Austria, Benelux (Belgium & Luxembourg), former Czechoslovakia (incl. Czech Republic & Slovacia), Germany, Hungary, Netherlands, Poland, Switzerland (incl. Liechtenstein), France (excl. Corsica), 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; Iraq.

Ecology: Biotroph; phytopathogenic; growing on stems or leaves, amphigenous. Host or Phorophyte Taxonomy: Arctium lappa L.; Arctium, Compositae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, .08-.145 mm in diam.. Margin: External filaments present (mostly shorter than the cleistothecial diam.); interlaced with each other or interwoven with surrounding mycelium, mycelioid, straight, .5-2 µm long, 4-8 µm in diameter, hyaline or faintly pigmented (brown throughout when fully mature), numerous (mostly), growing all across the lower half of the ascocarp, smooth, thin, not ramified, septate.

Asci: 5-12-(20) asci per ascocarp, distinctly stipitate, (40)-60-90 µm long, (20)-30-55 µm wide; dehiscence unitunicate.

Ascospores: 1–2 or c. 4 per ascus, spores 2-(4) per ascus, subglobose, ellipsoid, or ovoid, 20-32 µm long, 13-20 µm wide; septa absent.

Conidiophores: Euoidium-type; not branched; basal cells 80-190 µm long, 10-15 µm wide. Conidium Formation: Conidiogenous cells in chains. Conidia: Ellipsoid, ovoid, doliiform, or citriform (sometimes); macroconidial (germ tubes at an end or side of the conidium, long and narrow, apex without appressorium), not branched, 25-50 µm long, 18-30 µm wide; aseptate.

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