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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. (06-03-24); revised.

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

Type Information: Basionym: Erysiphopsis parnassiae Halst. Type: Erysiphopsis parnassiae Halst.

Taxonomic Literature: Taxonomic notes: +ascocarp outer wall cells obscure, irregularly polygonal, ca. 8-25(-30) µm diam.; +ascocarps somewhat dorsiventral, peridial cells of the upper half larger than those of the lower half;. Braun U., Beih. Nova Hedwigia 89: 1-700 [233] (1987).

Biogeography: Northern hemispheric. Continent: Northern America (USA: N.Y.; Canada: Ontario). Country or state(s): Ontario (Canada) and New York (USA).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Parnassia caroliniana Michx.; Parnassia, Parnassiaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, (.06)-.07-.115 mm in diam.. Margin: External filaments present (coarse, length variable, sometimes uniformly short or even rudimentary, sometimes long; tips obtuse); not interlaced, setiform, straight (tips otuse, rounded), .25-4 µm long, 6-13-(15) µm in diameter, pigmented (throughout, very long appendages often somewhat paler in the upper half), few or numerous, 5-15 per mm², growing somewhat all across the lower half of the ascocarp or between the lower and upper hald of the ascocarp, stiff and straight (and straight), smooth or rough, thin or moderatly thick, not ramified or ramified (rarely), sub-dichotomously branched or irregular, septate.

Asci: (3)-4-6-(7) asci per ascocarp, not stipitate or indistinctly stipitate, 50-65 µm long, 30-40 µm wide; dehiscence unitunicate.

Ascospores: 1–2 or c. 4 per ascus, spores (2)-3-5 per ascus, ellipsoid or ovoid, 14-23 µm long, 9-13 µm wide; septa absent.

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