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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. europaea U. Braun; Erysiphaceae Tul. & C. Tul.; Erysiphales.

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

Taxonomic Literature: Taxonomic notes: This variety differs from var. by ascomata and conidial characters, see below. 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 (Central Asia) and Europe (nearly all). Country or state(s): Finland, United Kingdom, Norway, Sweden, Austria, Benelux (Belgium & Luxembourg), former Czechoslovakia (incl. Czech Republic & Slovacia), Germany, Poland, France (excl. Corsica), Portugal, Spain (incl. Andorra & Monaco), Bulgaria, Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia), Former Yugoslavia [incl. Bosnia and Herzegovina, Croatia, Macedonia, Moldova, Serbia and Montenegro, Slovenia], Belarus, Baltic States (Estonia, Lithuania, Latvia), and Ukraine.

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Betula pubescens Ehrh.; 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, .075-.105 mm in diam.. Margin: External filaments present (shorter than the cleistothecial diam. or about as long as the diam.); recurved (when mature), .5-1 µm long, hyaline or pigmented (sometimes coloured at the base), few, 4-10-(13) per mm², growing 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 times, loosely), septate.

Asci: 2-6 asci per ascocarp, not stipitate or indistinctly stipitate, 40-65 µm long, 30-45 µm wide; dehiscence unitunicate.

Ascospores: c. 4 to c. 8 per ascus, spores 4-7 per ascus, ellipsoid or ovoid, 16-22 µm long, 9-15 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: More or less cylindrical; macroconidial, not branched, 28-38 µm long, 13-17 µm wide; aseptate.

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