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Data Set Maintenance: Data set compiled and standard item; reviewer(s): Schubert K. (06-03-24); revised.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: variety. Synonyms: Microsphaera ludens (E. S. Salmon) S. Blumer var. ludens; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera alni var. ludens E. S. Salmon. Type: Microsphaera alni var. ludens E. S. Salmon.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells irregularly polygonal, ca. 10-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [333-335] (1987).

Biogeography: Northern hemispheric. Continent: Northern America (USA, Canada). Country or state(s): Colarado (USA), Idaho (USA), Montana (USA), Oregon (USA), Washington (USA), Wyoming (USA), Illinois (USA), North Dakota (USA), South Dakota (USA), and Michigan (USA). Checklist records: United States and Canada (continental).

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

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, in loose groups (rarely) or gregarious, .095-.16 mm in diam.. Margin: External filaments present; partly recurved or straight, 1-2.5 µm long, 7-11 µm in diameter, hyaline, numerous, 6-25 per mm², growing more or less between the lower and upper hald of the ascocarp, flexuose, stiff and straight (and straight or somewhat flexuous (1), sometimes angularly bent), or geniculate (bent), smooth or somewhat rough, thin or thick (towards the base), ramified, dichotomously branched (3-6 times, branchings extremely variable, very irregular and diffuse, primary branches mostly elongated, tips straight, or apical branchings relatively close and regular, compact, tips partly recurved (the different branching types are to be found in a single collection or even in a single ascocarp) or trichotomously branched, aseptate or septate (0-2-septate).

Asci: 5-13 asci per ascocarp, distinctly stipitate (mostly), 50-70 µm long, 25-45 µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores 3-6 per ascus, ellipsoid or ovoid, 17-25 µm long, 10-14 µm wide; septa absent.

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