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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. (06-01-25); revised.

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

Type Information: Basionym: Microsphaera friesii var. friesii Lev. Type: Microsphaera friesii var. friesii Lev.

Taxonomic Literature: Taxonomic notes: +conidiophores foot-cells straight to curved, rarely flexuous, followed by (1-)2-3 cellls of about the same length (or somewhat shorter or somewhat longer);+appressoria lobed;+ascomata outer wall cells obscure, irregularly polygonal, ca. 8-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [420-422] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Asia-Temperate and Europe (widespread from France eastwards to the European part of the USSR and in northern Europe). Region(s): China (northwestern part, and Central Asia). Country or state(s): Denmark, United Kingdom, Norway, Sweden, Austria, former Czechoslovakia (incl. Czech Republic & Slovacia), Germany, Hungary, Poland, Switzerland (incl. Liechtenstein), France (excl. Corsica), Bulgaria, Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia), Romania, 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: Rhamnus cathartica L.; Rhamnus, Rhamnaceae.

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)-.08-.105-(.12) mm in diam.. Margin: External filaments present; setiform, recurved (tips of the ultimate branchlets recurved when mature), 1-2 µm long, 8-10.5 µm in diameter, hyaline or pigmented (at the base), few or numerous, 5-12 per mm², growing between the lower and upper hald of the ascocarp, stiff and straight (straight or curved), smooth or rough, thin or thick (towards the base), ramified, dichotomously branched (3-5 times, branches rather close, compact, regular, tips recurved when mature), aseptate or septate (0-1-septate).

Asci: 3-8 asci per ascocarp, not stipitate or indistinctly stipitate, 40-60 µm long, 30-45 µm wide; dehiscence unitunicate.

Ascospores: c. 4 to c. 8 per ascus, spores (2)-3-5 per ascus, subglobose, ellipsoid, or ovoid, 15-21-(24) µm long, 8.5-15 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched; basal cells 15-32.5 µm long, 7.5-10 µm wide. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid or cylindrical; macroconidial, not branched, 27-40 µm long, 10-16.5 µm wide; aseptate.

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