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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.; revised.

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

Taxonomic Literature: Taxonomic notes: +ascocarp outer wall cells very irregularly shaped, moderately large, (10-)15-30(-40) µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [131-132] (1987).

Biogeography: Northern hemispheric. Continent: Northern America. Country or state(s): Colarado (USA), Montana (USA), Oregon (USA), Washington (USA), Wyoming (USA), Iowa (USA), Kansas (USA), Minnesota (USA), North Dakota (USA), Wisconsin (USA), New York (USA), and California (USA).

Ecology: Biotroph; phytopathogenic; growing on stems or leaves. Host or Phorophyte Taxonomy: Viola canadensis L.; Viola, Violaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups (sometimes), (.07)-.075-.105-(.11) mm in diam.. Margin: External filaments present; interlaced with each other (and with the appendages of the neighbouring ascocarps), mycelioid, straight, (1)-2-5-(6.5) µm long, 4-12 µm in diameter, pigmented (brown throughout when mature or paler upwards), numerous, growing all across the lower half of the ascocarp or on the upper half of the ascocarp (partly), flexuose (often rather straight), smooth, thin, not ramified, septate.

Asci: 1 asci per ascocarp, not stipitate, 65-95 µm long, 55-75 µm wide; dehiscence unitunicate.

Ascospores: c. 8 (spores large, early developed) per ascus, spores 6-8 per ascus, subglobose (rarely; +rarely ovoid; +rarely subcylindrical), ellipsoid, ovoid, or sub-cylindrical, 18.5-31 µm long, 13-18 µm wide; septa absent.

Conidiophores: Euoidium-type; not branched. Conidium Formation: Conidiogenous cells in chains. Conidia: Ellipsoid, ovoid, or doliiform; macroconidial, not branched, 25-35 µm long, 13-18 µm wide; aseptate; with distintly visible fibrosin body fibrosin bodies.

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