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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. (06-03-27); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Erysiphe sepulta Ellis & Everh. Type: Erysiphe sepulta Ellis & Everh.

Taxonomic Literature: Taxonomic notes: +ascocarp outer wall cells obscure, irregularly shaped, 5-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [231-232] (1987).

Biogeography: Northern hemispheric. Continent: Northern America (USA, western states, Calif. to Colo., Wyo. Mont.). Country or state(s): Colarado (USA), Montana (USA), Wyoming (USA), and California (USA).

Ecology: Biotroph; phytopathogenic; growing on stems or leaves, amphigenous. Host or Phorophyte Taxonomy: Chrysothamnus nauseosus (Pall. ex Pursh) Britton; Chrysothamnus, Compositae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, not emerging (in the pannose tomentum of the host plant), in loose groups or gregarious, .1-.22 mm in diam.. Margin: External filaments present (very short, sometimes poorly developed); mycelioid, straight, 5-7.5 µm in diameter, hyaline or faintly pigmented (in the lower half), few (sometimes poorly developed) or numerous, growing all across the lower half of the ascocarp, thin, not ramified, septate.

Asci: 20-40 asci per ascocarp, distinctly stipitate, 60-100 µm long, 25-45 µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores (3)-4-6-(8) per ascus, ellipsoid or ovoid, 16-26 µm long, 10-15 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid (rarely; 6: rarely), ovoid, doliiform, or cylindrical; macroconidial, not branched, 24-34 µm long, 13-17 µm wide; aseptate.

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