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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. (06-03-23); revised.

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

Type Information: Basionym: Microsphaera hedysari U. Braun. Type: Microsphaera hedysari U. Braun.

Taxonomic Literature: Taxonomic notes: +ascocarp outer wall cells obscure, irregularly polygonal, about 6-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [314-316] (1987); Braun U. The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Asia-Temperate (Central Asia) and Europe. Region(s): Siberia and China. Country or state(s): Portugal and Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia).

Ecology: Biotroph; phytopathogenic; growing on stems (above all caulicolous, sometimes (4) leaves) or leaves, amphigenous. Host or Phorophyte Taxonomy: Hedysarum scoparium Fisch. & C.A. Mey.; Hedysarum, Leguminosae-Papilionoideae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered (rarely) or gregarious, (.095)-.11-.17-(.18) mm in diam.. Margin: External filaments present (gracile, horizontally spread); interlaced with each other, recurved or straight, .5-4 µm long, 3.5-8.5-(9) µm in diameter, hyaline or pigmented (near the base), numerous, 5-20 per mm², growing between the lower and upper hald of the ascocarp (occasionally subequatorially), flexuose or geniculate (bent) (to undulate, sometimes subnodulose, occasionally subhelicoid, irregularly shaped), verrucose (mostly), thin, moderatly thick (throughout or thick-walled towards the base), or thick, not ramified or ramified, dichotomously branched (1-3(-4) times, branchings loose, irregular, primary branches long, tips straight or recurved), aseptate or septate (0-2(-3)-septate).

Asci: 5-15 asci per ascocarp, indistinctly stipitate, 45-75-(85) µm long, 30-45 µm wide; dehiscence unitunicate.

Ascospores: 1–2 to c. 8 per ascus, spores (2)-4-6-(7) per ascus, subglobose, ellipsoid, or ovoid, 16-26-(30) µm long, 9.5-15-(17.5) µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid, doliiform, or sub-cylindrical; macroconidial, not branched, 24-40 µm long, (11)-13-20 µm wide; aseptate.

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