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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. Taxonomic rank: variety. Synonyms: Microsphaera lonicerae (DC.) G. Winter var. lonicerae; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Taxonomic Literature: Taxonomic notes: +appressoria lobed;+conidiophores foot-cells followed by two somewhat shorter cells;+ascocarp outer wall cells obscure, irregularly polygonal or rounded, ca. 10-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [327-330] (1987); Braun U. The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Asia-Temperate (Central Asia) and Europe. Country or state(s): Finland, United Kingdom, Norway, Sweden, Austria, Benelux (Belgium & Luxembourg), former Czechoslovakia (incl. Czech Republic & Slovacia), Germany, Hungary, Netherlands, Poland, Switzerland (incl. Liechtenstein), France (excl. Corsica), Spain (incl. Andorra & Monaco), Greece, Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia), Romania, European Turkey, Former Yugoslavia [incl. Bosnia and Herzegovina, Croatia, Macedonia, Moldova, Serbia and Montenegro, Slovenia], Belarus, Baltic States (Estonia, Lithuania, Latvia), and Ukraine; Japan.

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Lonicera caprifolia L.; Lonicera, Caprifoliaceae.

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)-.07-.11-(.12) mm in diam.. Margin: External filaments present (straight to curved, sometimes irregularly bent); recurved (occasionally) or straight, 1-3 µm long, 6-9 µm in diameter, hyaline or pigmented (at the very base, sometimes in the lower half of the stalk), few, 6-12 per mm², growing between the lower and upper hald of the ascocarp, flexuose (often) or geniculate (bent) (sometimes irregularly bent), smooth or rough (below), thin or thick (towards the base), ramified, dichotomously branched (3-5 times, loosely and irregularly, branchings diffuse, wide, primary branches often elongated, sometimes closer and more regular, tips straight, not recurved, few tips occasionally recurved), aseptate or septate (1-3 septa).

Asci: 2-8 asci per ascocarp, not stipitate or indistinctly stipitate, 40-55 µm long, 25-45-(50) µm wide; dehiscence unitunicate.

Ascospores: c. 4 to c. 8 per ascus, spores (3)-4-5-(6) per ascus, ellipsoid or ovoid, 15-25 µm long, 8-15 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched; basal cells 20-25 µm long, 8-9 µm wide. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid (sometimes) or more or less cylindrical; macroconidial (length and width measured in dry state), not branched, 25-35 µm long, 11-15 µm wide; aseptate.

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