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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. (06-03-22); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Microsphaera chouardii Durrieu; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera chouardii Durrieu. Type: Microsphaera chouardii Durrieu.

Taxonomic Literature: Taxonomic notes: +ascocarp outer wall cells irregularly polygonal to rounded, ca. 8-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [304-306] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Europe. Country or state(s): France (excl. Corsica) (endemic).

Ecology: Biotroph; phytopathogenic; growing on leaves, hypophyllous (mostly) or amphigenous. Host or Phorophyte Taxonomy: Ononis tridentata 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, .09-.18 mm in diam.. Margin: External filaments present (long and flaccid, not mycelioid, with a tendency to turn towards one direction); interlaced with each other, straight (not mycelioid), (2)-3-6 µm long, hyaline or pigmented (near the base), numerous, 5-24 per mm², growing somewhat all across the lower half of the ascocarp or between the lower and upper hald of the ascocarp, smooth or rough (below), thin or moderatly thick (towards the base), ramified, dichotomously branched (loose, diffuse, often deeply cleft, tips not recurved, straight), aseptate or septate (1-2 septa).

Asci: 5-12 asci per ascocarp, not stipitate (sometimes) or indistinctly stipitate, (40)-50-75-(80) µm long, 25-40-(45) µm wide; dehiscence unitunicate.

Ascospores: 1–2 or c. 4 per ascus, spores (2)-3-4-(5) per ascus, ellipsoid, broadly ellipsoid, ovoid, or cylindrical, 18-30 µm long, 9.5-15.5 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: More or less cylindrical; macroconidial, not branched, 28-40 µm long, 12-18 µm wide; aseptate.

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