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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. (06-01-24); revised.

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

Type Information: Basionym: Erysiphe graminis DC. Type: Blumeria graminis (DC.) Speer.

Taxonomic Literature: Taxonomic notes: +appressoria nipple-shaped, ca. 3.5-7 µm wide, single or opposite in pairs;+conidiophores foot cells with a bulbous swelling (ca. 10-15 µm wide), followed by shorter cells (ca. 12.5-25 µm long);+secondary mycelium present, consists of bristle-like hyphae, they are straight to curved, falcate, thick-walled, ca. 200-400 x 4-7 µm, at first hyaline, later coloured, greyish to brown or ochreous to rusty brown-red, aseptate, this mycelium often forms a dense felt on the host leaves or stems;+ascomata outer wall cells obcsure, irregularly polygonal, ca. 8-20 µm diam. Braun U., Beih. Nova Hedwigia 89: 1-700 [268-271] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Cosmopolitan. Continent: Europe, Northern America, and Southern America (Argentina). 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), Portugal, Spain (incl. Andorra & Monaco), Bulgaria, Greece, 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; Alaska (USA), Colarado (USA), Idaho (USA), Montana (USA), Oregon (USA), Washington (USA), Wyoming (USA), Illinois (USA), Iowa (USA), Kansas (USA), Minnesota (USA), Missouri (USA), North Dakota (USA), Nebraska (USA), Oklahoma (USA), South Dakota (USA), Wisconsin (USA), Connecticut (USA), Indiana (USA), Maine (USA), Michigan (USA), New Hampshire (USA), New Jersey (USA), New York (USA), Ohio (USA), Pennsylvania (USA), Rhode Island (USA), Vermont (USA), West Virginia (USA), Arizona (USA), California (USA), Nevada (USA), Utah (USA), New Mexico (USA), Texas (USA), Arkansas (USA), Delaware (USA), Florida (USA), Georgia (USA), Maryland (USA), Mississippi (USA), North Carolina (USA), South Carolina (USA), Tennessee (USA), and Virginia (USA).

Ecology: Biotroph; phytopathogenic; growing on stems, leaves, or inflorescences, amphigenous. Host or Phorophyte Taxonomy: Triticum aestivum; Gramineae.

Reproduction Strategy: With sexual (and possible asexual) stages (globose-depressed, later concave). Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, not emerging (usually, in the dense mycelial layer), in loose groups or gregarious, .11-.28 mm in diam.. Margin: External filaments present (mostly scarcely developed, usually short, shorter than the cleistothecial diam.); interwoven with surrounding mycelium, mycelioid, straight, hyaline or pigmented, few or numerous, growing all across the lower half of the ascocarp, thin, not ramified or ramified (rarely), not branched or rarely irregular, septate.

Asci: 6-30 asci per ascocarp, distinctly stipitate, 50-105 µm long, 20-45 µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores (4)-8 per ascus, ellipsoid or ovoid, 20-24 µm long, 10-14 µm wide; septa absent; wall hyaline (or somewhat faintly coloured).

Conidiophores: Euoidium-type; not branched. Conidium Formation: Conidiogenous cells in chains. Conidia: Ellipsoid or citriform; macroconidial (conidia rarely wider at one end or slightly constricted at the centre, germ tubes at an end or side of the conidium, straight or somewhat flexuous, ca. 12-50 x 2.5-4 µm, terminating in an unlobed appressorium), (20)-24-35-(45) µm long, (8)-12-16-(20) µm wide.

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