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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. (06-03-23); revised.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Synonyms: Microsphaera divaricata (Wallr.) Lev.; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Alphitomorpha divaricata Wallr. Type: Alphitomorpha divaricata Wallr.

Taxonomic Literature: Taxonomic notes: +conidiophores foot-cells sometimes curved or flexuous, followed by (1-)2(-3) shorter cells or cells of about the same length;+appressoria lobed;+ascomata outer wall cells irregularly polygonal, ca. 10-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [354-355] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Europe (from France to the European part of the USSR, also in northern Europe). Country or state(s): Denmark, Finland, Norway, Sweden, Austria, Benelux (Belgium & Luxembourg), former Czechoslovakia (incl. Czech Republic & Slovacia), Germany, Hungary, Netherlands, Poland, Switzerland (incl. Liechtenstein), France (excl. Corsica), Bulgaria, Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia), Romania, Belarus, Baltic States (Estonia, Lithuania, Latvia), and Ukraine.

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Frangula alnus Mill.; Frangula, Rhamnaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, (.07)-.08-.11-(.135) mm in diam.. Margin: External filaments present (long and flaccid); recurved (when mature), (1.5)-3-5-(7) µm long, 6-10 µm in diameter, hyaline or pigmented (near the base), few, 4-12-(16) per mm², growing between the lower and upper hald of the ascocarp, smooth or rough (near the base), thin or thick (towards the base), ramified, dichotomously branched (2-4 times, primary branches usually elongated, divergent, often somewhat recurved, tips of the ultimate branchlets recurved when mature, branchings occasionally somewhat irregular), aseptate or septate (0-3-septate).

Asci: 3-7 asci per ascocarp, not stipitate or indistinctly stipitate, 30-60 µm long, 25-40 µm wide; dehiscence unitunicate.

Ascospores: c. 4 to c. 8 per ascus, spores 3-6 per ascus, ellipsoid or ovoid, 16-23 µm long, 9-13 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched; basal cells (20)-25-33-(40) µm long, 7.5-10 µm wide. Conidium Formation: Conidiogenous cells single. Conidia: More or less ellipsoid; macroconidial, not branched, 30-42 µm long, 13-20 µm wide; aseptate.

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