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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. (06-01-24); revised.

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

Biogeography: Continent: Asia-Temperate. Country or state(s): Korea (North & South) (only known from the type collection).

Ecology: Biotroph; phytopathogenic; growing on leaves, epiphyllous. Host or Phorophyte Taxonomy: Aceriphyllum rossii Engl.; Aceriphyllum, Saxifragaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, .1-.15 mm in diam.. Margin: External filaments present; pigmented (brown), numerous.

Asci: 5-7 asci per ascocarp, 60-70 µm long, 33-40 µm wide; dehiscence unitunicate.

Ascospores: c. 4 to c. 8 per ascus, spores 3-5 per ascus, ellipsoid, 23-26 µm long, 10-12 µm wide; septa absent.

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