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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-26). Data set reviewer(s): Schubert K. (06-03-23); revised.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Synonyms: Microsphaera dimorpha (Y. N. Yu & Z. Y. Zhao) U. Braun; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera berberidis var. dimorpha Y. N. Yu & Z. Y. Zhao. Type: Microsphaera berberidis var. dimorpha Y. N. Yu & Z. Y. Zhao.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells irregularly polygonal, ca. 10-15(-20) µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [403-404] (1987).

Biogeography: Continent: Asia-Temperate. Region(s): China. Country or state(s): Kazakhstan.

Ecology: Biotroph; phytopathogenic; growing on leaves, epiphyllous (mostly) or amphigenous. Host or Phorophyte Taxonomy: Berberis heteropoda Schrenk; Berberis, Berberidaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, (.065)-.075-.09-(.125) mm in diam.. Margin: External filaments present (straight to curved); recurved (distinctly, tips at least partly recurved when mature) or straight, .9-1.5-2.2 µm long, 6-10 µm in diameter, hyaline or pigmented (at the base), few or numerous, (5)-9-12-(17) per mm², growing between the lower and upper hald of the ascocarp, stiff and straight (to curved), smooth or verrucose, ramified, dichotomously branched ((2-)4-5 times, branchings variable, usually rather close and compact, regular, tips either obtuse, truncate, not recurved, or distinctly recurved, tips at least partly recurved when mature), aseptate.

Asci: 2-6 asci per ascocarp, not stipitate or indistinctly stipitate, 39-59 µm long, 27-40 µm wide; dehiscence unitunicate.

Ascospores: 1–2 to c. 8 per ascus, spores (2)-4-5-(7) per ascus, ellipsoid or ovoid, 17-25 µm long, 7-13 µm wide; septa absent.

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