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Data Set Maintenance: Data set compiled and standard item; reviewer(s): Schubert K. (06-03-24); not revised (00-08-08).

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: variety. Synonyms: Microsphaera ludens var. lathyri U. Braun; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera ludens var. lathyri U. Braun. Type: Microsphaera ludens var. lathyri U. Braun.

Taxonomic Literature: Taxonomic notes: This variety differs from var. ludens by the mode of branching of the cleistothecial appendages. The apex of the appendages is usually rather regulary and closely branched, rarely irregular, diffuse, the tips of the ultimate branchlets are often somewhat recurved in fully mature samples. also see differences in ascomata characters. Braun U., Beih. Nova Hedwigia 89: 1-700 [333-335] (1987).

Biogeography: Continent: Northern America (USA, Canada). Country or state(s): Nebraska (USA).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Lathyrus odoratus L.; Lathyrus, 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, .09-.13-(.16) mm in diam.. Margin: External filaments present; recurved (often somewhat recurved when fully mature) or straight, 1-2 µm long, 7-12 µm in diameter, hyaline, few or numerous, 6-18 per mm², growing between the lower and upper hald of the ascocarp, flexuose or stiff and straight, smooth or rough (somewhat), thin or thick (towards the base), ramified, dichotomously branched (4-6 times), aseptate or septate (0-2 septa).

Asci: 4-9 asci per ascocarp, distinctly stipitate, 40-70 µm long, 30-45 µm wide; dehiscence unitunicate.

Ascospores: 1–2 to c. 8 per ascus, spores (2)-3-6 per ascus, ellipsoid or ovoid, 18-24 µm long, 10-14 µm wide; septa absent.

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