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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 var. ehrenbergii (Lév.) U. Braun; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera ehrenbergii Lév. Type: Microsphaera ehrenbergii Lév.

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.;Well agreeing with var. lonicerae, but different by very numerous appendages, mostly 10-20, sometimes more, 1-2 times as long as the cleistothecial diam, usually rather stiff, branchings diffuse to close and regular. 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, Europe, and Northern America (introduced in USA & Canada, widespread). Region(s): Far Eastern Asia and China (+Central Asia). Country or state(s): Finland, United Kingdom, Norway, Sweden, Austria, former Czechoslovakia (incl. Czech Republic & Slovacia), Germany, Hungary, Netherlands, Poland, Switzerland (incl. Liechtenstein), France (excl. Corsica), 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; Japan; Ontario (Canada) and Connecticut (USA). Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Lonicera tatarica 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, 1-2 µm long, 6-9 µm in diameter, hyaline or pigmented (coloured at the very base, sometimes coloured in the lower half of the stalk), very numerous, 10-20 per mm², growing between the lower and upper hald of the ascocarp, stiff and straight (usually rather stiff), smooth or rough (below), thin or thick (towards the base), ramified, dichotomously branched (3-5 times, branchings diffuse to close and regular), 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 or 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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