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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. Taxonomic rank: species. Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera caulicola Petr. Type: Microsphaera caulicola Petr.

Taxonomic Literature: Taxonomic notes: +ascocarp outer wall cells obscure, polygonal to rounded, ca. 8-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [184-185] (1987); Braun, U. The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Asia-Temperate and Europe. Country or state(s): Hungary, Romania, and Ukraine; Kazakhstan and Iran.

Ecology: Biotroph; phytopathogenic; growing on stems. Host or Phorophyte Taxonomy: Astragalus sp.; Astragalus, Leguminosae-Papilionoideae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, in loose groups or gregarious, (.1)-.11-.185-(.21) mm in diam.. Margin: External filaments present (undulate-geniculate, often); straight, .5-3 µm long, 3.5-7 µm in diameter, hyaline, numerous, growing all across the lower half of the ascocarp or between the lower and upper hald of the ascocarp, strongly flexuose (often "knoby", angularly bent) or geniculate (bent) (undulate-), smooth or faintly rough, not ramified (mostly) or ramified (some with 1-2 irregular or subdichotomous branchings), sub-dichotomously branched or irregular, aseptate or septate (with few septa, inconspicuous).

Asci: 5-15 asci per ascocarp, indistinctly stipitate, 60-80 µm long, 30-45 µm wide; dehiscence unitunicate (asci number: occasionally more than 15).

Ascospores: 1–2, c. 4, or c. 8 per ascus, spores (2)-4-7 per ascus, ellipsoid or ovoid, 16-25 µm long, 10-14 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid or cylindrical (oblong); macroconidial, not branched, 30-45 µm long, 14-18 µm wide; aseptate.

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