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Data Set Maintenance: Data set compiled and standard item; reviewer(s): Schubert K. (06-03-24); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Microsphaera rosae H. Karis; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera rosae H. Karis. Type: Microsphaera rosae H. Karis.

Biogeography: Continent: Asia-Temperate. Country or state(s): Yakutiya (Russia) (only known from the type collection).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Rosa acicularis Lindl.; Rosa, Rosaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered, .103-.132 mm in diam.. Margin: External filaments present (up to 150 µm in length); straight, up to 150 µm long, hyaline or pigmented (at the base, brown), few, 10-15 per mm², ramified, dichotomously branched (3 times, tips of the ultimate branchlets not recurved), septate.

Asci: 6-10 asci per ascocarp, cylindrical (ellipsoid), 56-79 µm long, 33-54 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 8 per ascus, ellipsoid, 15.4-23.8 µm long, 9.8-14 µm wide; septa absent.

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