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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. (06-01-25); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: variety. Synonyms: Microsphaera berberidis var. berberidis (DC.) Lév.; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Erysiphe berberidis DC. Type: Erysiphe berberidis DC.

Taxonomic Literature: Taxonomic notes: +conidiophores foot-cells cylindric, slender, followed by 1(-2) shorter cells, cells sometimes about as long as the foot-cell;+appressoria nipple-shaped to lobed;+ascocarp outer wall cells irregularly polygonal, ca. 8-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [330-331] (1987); Braun U. The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Africa, Asia-Temperate (Central Asia, Asia Minor), and Europe. Region(s): Southern Africa (introduced). Country or state(s): Denmark, Finland, United Kingdom, Norway, Sweden, Austria, 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, European Turkey, Former Yugoslavia [incl. Bosnia and Herzegovina, Croatia, Macedonia, Moldova, Serbia and Montenegro, Slovenia], Belarus, Baltic States (Estonia, Lithuania, Latvia), and Ukraine; Iran and Turkey (excl. European Turkey).

Ecology: Biotroph; phytopathogenic; growing on stems, leaves, or fruits (sometimes; + sometimes on stems (2)), epiphyllous (mostly) or amphigenous. Host or Phorophyte Taxonomy: Berberis sp.; Berberis, Berberidaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, .08-.13 mm in diam.. Margin: External filaments present; setiform, straight (tips of the ultimate branchlets not recurved), (1)-1.5-2-(3) µm long, 7-12 µm in diameter, hyaline or pigmented (at the very base), few or numerous, 5-20 per mm², growing between the lower and upper hald of the ascocarp, flexuose or stiff and straight (usually), smooth or rough, thin, moderatly thick, or thick (towards the base, sometimes moderately thick-walled throughout), ramified, dichotomously branched (3-5 times, branchings loose and diffuse, primary and secondary branches often elongated, tips straight, not recurved), aseptate or septate (0-1-septate).

Asci: 4-10 asci per ascocarp, not stipitate or indistinctly stipitate, 40-60 µm long, 25-40 µm wide; dehiscence unitunicate.

Ascospores: c. 4 to c. 8 per ascus, spores 3-5-(6) per ascus, ellipsoid or ovoid, 16-25 µm long, 9-14 µm wide.

Conidiophores: Pseudoidium-type; not branched; basal cells 20-35-(45) µm long, 6-8.7 µm wide. Conidium Formation: Conidiogenous cells single. Conidia: Cylindrical (both ends rounded, slender); macroconidial (germ tubes arising from an end of the spore, short to moderately long, simple or with lobed appressorium), not branched, rounded at both ends, 27-48 µm long, 9-15.5 µm wide; aseptate.

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