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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. (06-03-24); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Microsphaera magnusii S. Blumer; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera magnusii S. Blumer. Type: Microsphaera magnusii S. Blumer.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells irregularly polygonal or rounded, ca. 10-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [356-357] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Asia-Temperate (Central Asia, generally fairly rare) and Europe. Country or state(s): Finland, Norway, Sweden, Austria, former Czechoslovakia (incl. Czech Republic & Slovacia), Germany, Netherlands, Poland, Switzerland (incl. Liechtenstein), France (excl. Corsica), Spain (incl. Andorra & Monaco), 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: Lonicera nigra L.; Lonicera, Caprifoliaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered, .06-.09-(.1) mm in diam.. Margin: External filaments present (long and flaccid); circinate (sometimes nearly) or recurved (when mature), 2-10 µm long, 4-10 µm in diameter, hyaline or pigmented (at the base), few, 5-15 per mm², growing more or less between the lower and upper hald of the ascocarp, smooth or rough (near the base), thin or thick (towards the base), ramified, dichotomously branched (2-5 times, branchings rather loose and irregular, primary branches often elongated, sometimes recurved, some branchings close and regular, tips in mature samples recurved, sometimes nearly circinate), aseptate or septate (0-2-septate).

Asci: 2-6-(7) asci per ascocarp, not stipitate or indistinctly stipitate, 35-55 µm long, (25)-30-45 µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores (3)-4-5-(6) per ascus, ellipsoid or ovoid, (15)-18-26 µm long, (9)-10-14 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Macroconidial, not branched, 20-30 µm long, 9-18 µm wide; aseptate.

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