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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. (06-01-24); revised.

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

Type Information: Basionym: Microsphaera baeumleri Magnus. Type: Microsphaera baeumleri Magnus.

Taxonomic Literature: Taxonomic notes: +conidia germ tubes at an end, short;+ascocarp outer wall cells irregularly polygonal to rounded, ca. 8-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [296-297] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (199.

Biogeography: Continent: Asia-Temperate, Europe, and Northern America (USA, Canada). Region(s): Siberia and China (Central Asia to China). Country or state(s): Finland, United Kingdom, Norway, Sweden, Austria, former Czechoslovakia (incl. Czech Republic & Slovacia), Germany, Hungary, Poland, Switzerland (incl. Liechtenstein), France (excl. Corsica), Bulgaria, Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia), Romania, Former Yugoslavia [incl. Bosnia and Herzegovina, Croatia, Macedonia, Moldova, Serbia and Montenegro, Slovenia], Belarus, Baltic States (Estonia, Lithuania, Latvia), and Ukraine; Japan.

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Vicia sylvatica L.; Leguminosae-Papilionoideae.

Reproduction Strategy: With sexual (and possible asexual) stages (horizontally spread, but mostly with a tendency to turn towards one direction). Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, (.07)-.08-.13-(.15) mm in diam.. Margin: External filaments present; interlaced with each other (sometimes loosely), mycelioid or setiform (intermediate type), straight, (2)-3-6-(10) µm long, 5-10.5 µm in diameter, hyaline or pigmented (only at the base, very rarely faintly coloured in the lower half), numerous, 8-20 per mm², growing more or less between the lower and upper hald of the ascocarp, thin or thick (towards the base), not ramified or ramified (a varying percentage of appendages 1-3 times branched, rarely up to 5 times, branchings lax, diffuse, often deeply cleft or forked in the lower half, tips not recurved straight), aseptate or septate (1-2 septa near the base).

Asci: 4-12 asci per ascocarp, not stipitate (sometimes) or indistinctly stipitate, (40)-50-70 µm long, (25)-30-40-(45) µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores (2)-3-5-(6) per ascus, subglobose, ellipsoid, or ovoid, 15-25 µm long, 9-15 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid or cylindrical; macroconidial (germ tubes arising from an end, short), not branched, 30-38 µm long, 13-19 µm wide; aseptate.

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