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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. (06-03-27); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Erysiphe pisi var. cruciferarum (Opiz ex L. Junell) Ialongo; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Erysiphe cruciferarum Opiz ex L. Junell. Type: Erysiphe cruciferarum Opiz ex L. Junell.

Taxonomic Literature: Taxonomic notes: +conidiophores foot-cells cylindric, moderately long, ca. 15-50 x 7-10 µm, followed by (1-)2(-4) shorter or sometimes somewhat longer cells;+appressoria unlobed or moderately lobed;+ascocarp outer wall cells irregularly polygonal to rounded, ca. 8-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [203-204] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Nearly cosmopolitan. Continent: Africa, Asia-Temperate, Australasia, Europe, Northern America, Southern America (Argentina), and Asia-Tropical. Region(s): Southern Africa, Australia, and New Zealand. Country or state(s): Denmark, Finland, United Kingdom, Norway, Sweden, Austria, Benelux (Belgium & Luxembourg), former Czechoslovakia (incl. Czech Republic & Slovacia), Germany, Hungary, 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; Canary Islands (Spain); Hawaii (USA); Idaho (USA), Oregon (USA), Washington (USA), Iowa (USA), Minnesota (USA), Missouri (USA), Nebraska (USA), Oklahoma (USA), Connecticut (USA), Indiana (USA), Massachusetts (USA), New Jersey (USA), West Virginia (USA), Arizona (USA), California (USA), Nevada (USA), Utah (USA), Texas (USA), Florida (USA), Maryland (USA), and North Carolina (USA). Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on stems, leaves, and fruits, amphigenous. Host or Phorophyte Taxonomy: Alyssum alyssoides L.; Alyssum, Capparaceae, Cruciferae, Papaveraceae (and Fumariaceae), and Resedaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered and gregarious, .085-.15 mm in diam.. Margin: External filaments present (length variable); mycelioid, straight, (.5)-1-2-(3.5) µm long, 4-10 µm in diameter, hyaline and pigmented (later, yellowish to brownish in the lower half, paler in the upper half), numerous, growing all across the lower half of the ascocarp, smooth and rough, thin, not ramified and ramified, not branched, septate.

Asci: (3)-4-10-(12) asci per ascocarp, rarely not stipitate or indistinctly stipitate (usually), (40)-50-85 µm long, 25-45-(50) µm wide; dehiscence unitunicate.

Ascospores: 1–2, c. 4, or c. 8 per ascus, spores (2)-3-6-(8) per ascus, ellipsoid or ovoid, (15)-18-24-(30) µm long, 10-14-(16) µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched; basal cells 15-50 µm long, 7-10 µm wide. Conidium Formation: Conidiogenous cells single. Conidia: Doliiform or cylindrical; macroconidial, not branched, (27)-30-48-(55) µm long, 12-21 µm wide; aseptate.

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