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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-27). Data set reviewer(s): Schubert K. (06-03-24); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: variety. Synonyms: Microsphaera ornata var. ornata U. Braun; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera ornata U. Braun var. ornata. Type: Microsphaera ornata U. Braun var. ornata.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells irregularly polygonal, ca. 10-25(-30) µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [422-424] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Asia-Temperate, Europe, and Northern America (USA, Canada, widespread). Region(s): East Europe (very rare), Siberia (and Central Asia), and Far Eastern Asia. Country or state(s): Ukraine (very rare); Minnesota (USA), Wisconsin (USA), Massachusetts (USA), Michigan (USA), New Hampshire (USA), Ohio (USA), Pennsylvania (USA), and West Virginia (USA). Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Betula lenta L.; Betula, Betulaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, .07-.105 mm in diam.. Margin: External filaments present (often more than 10); recurved (when mature), 1-1.5 µm long, 6-9 µm in diameter, hyaline or pigmented (sometimes at the base), numerous, 6-22 per mm², growing more or less between the lower and upper hald of the ascocarp, stiff and straight, smooth or rough, thin or moderatly thick (towards the base), ramified, dichotomously branched (3-5(-6) times, branches rather loose, primary and secondary branches often elongated, tips of the ultimate branchlets recurved when mature, stalk occasionally forked in the lower half), aseptate or septate (0-1-septate).

Asci: 3-6 asci per ascocarp, not stipitate or indistinctly stipitate, 35-60 µm long, 30-50 µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores 4-8 per ascus, ellipsoid or ovoid, 16-24 µm long, 8.5-15 µm wide; septa absent.

Conidiophores: Pseudoidium-type. Conidium Formation: Conidiogenous cells single. Conidia: Doliiform or more or less cylindrical; macroconidial, not branched; aseptate.

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