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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. (06-04-04); revised.

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

Type Information: Basionym: Erysiphe cumminsiana U. Braun. Type: Erysiphe cumminsiana U. Braun.

Taxonomic Literature: Taxonomic notes: +appresssoria more or less lobed;+ascocarp outer wall cells irregularly shaped, ca. 5-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [237-238] (1987).

Biogeography: Northern hemispheric. Continent: Asia-Temperate and Northern America (USA: Colo., N. Mex., Wisc., Ariz.). Country or state(s): Japan; Colarado (USA), Wisconsin (USA), Pennsylvania (USA), Arizona (USA), and New Mexico (USA). Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on stems (mycelium often covering large segments of the stems) or leaves, amphigenous. Host or Phorophyte Taxonomy: Senecio seemannii Sch.Bip.; Senecio, Compositae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, evenly scattered or in loose groups (occasionally), .09-.18 mm in diam.. Margin: External filaments present (well developed); interlaced with each other or interwoven with surrounding mycelium (in samples with persistent mycelium), mycelioid (irregular), straight, .5-2.5-(4) µm long, 3-9 µm in diameter, hyaline or faintly pigmented (sometimes, yellowish), few (rarely) or numerous, growing all across the lower half of the ascocarp, smooth or faintly rough, thin, not ramified or ramified (rarely), not branched, septate (few inconspicuous septa).

Asci: 5-18 asci per ascocarp, not stipitate or indistinctly stipitate, (35)-45-70-(80) µm long, 25-40 µm wide; dehiscence unitunicate (thin walled, content often yellowish, not fully developed on specimens of the current season, spores not developed before overwintering).

Conidiophores: Euoidium-type; not branched. Conidium Formation: Conidiogenous cells in chains. Conidia: Ellipsoid, doliiform, or cylindrical; macroconidial, not branched, 29-38 µm long, 13-19.5 µm wide; aseptate.

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