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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. (06-01-25); revised.

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

Type Information: Basionym: Erysiphe cruchetiana S. Blumer. Type: Erysiphe cruchetiana S. Blumer.

Taxonomic Literature: Taxonomic notes: +appressoria moderately lobed, haustoria ca. 17-25 µm diam.;+conidiophores foot-cells subcylindric or width somewhat decreasing from base to top, followed by a longer and a shorter cell or by two shorter cells;+ascocarp outer wall cells obscure, irregularly polygonal, 8-25 µm diam.;This variety differs from var. pisa by appendage characters, see below. Braun U., Beih. Nova Hedwigia 89: 1-700 [195-197] (1987); Braun, U. The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Africa, Asia-Temperate (Central Asia, Asia Minor), Australasia, and Europe. Region(s): Northern Africa and Caucasus. Country or state(s): Denmark, United Kingdom, 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], Baltic States (Estonia, Lithuania, Latvia), Crimea (Ukraine), and North-western Russia; Morocco; Iran.

Ecology: Biotroph; phytopathogenic; growing on stems, leaves, or fruits, amphigenous. Host or Phorophyte Taxonomy: Ononis arvensis L.; Ononis, Leguminosae-Papilionoideae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, (.08)-.085-.15 mm in diam.. Margin: External filaments present; interlaced with each other or interwoven with surrounding mycelium, mycelioid, straight, (.25)-.5-3-(5) µm long, 4-10 µm in diameter, hyaline or pigmented (when mature, brown throughout or paler upwards, sometimes hyaline in the upper half), numerous, growing all across the lower half of the ascocarp, smooth or rough, ramified, irregular (frequently), septate.

Asci: (3)-4-8-(13) asci per ascocarp, not stipitate or indistinctly stipitate, 40-85 µm long, 25-55 µm wide; dehiscence unitunicate.

Ascospores: 1–2 to c. 8 per ascus, spores (2)-3-6 per ascus, ellipsoid or ovoid, (15)-18-25-(28) µm long, 10-16.5 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched; basal cells (15)-20-50-(70) µm long, 6-10 µm wide. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid or cylindrical; macroconidial (germ tubes on an end, occasionally on a side, short or up to 50 µm in length, 2.5-4 µm wide, terminating in an unlobed or moderately lobed appressorium), not branched, 24-55 µm long, 13.5-22 µm wide; aseptate.

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