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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-31). Data set reviewer(s): Schubert K. (06-03-02); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Erysiphaceae Tul. & C. Tul.; Erysiphales.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells obscure, irregularly polygonal, ca. 8-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [540] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Asia-Temperate, Europe (introduced), and Asia-Tropical. Region(s): China (and Central Asia). Country or state(s): Belarus, Baltic States (Estonia, Lithuania, Latvia), and Ukraine (European part of the USSR); Kazakhstan, Uzbekistan, Japan, and Korea (North & South); India.

Ecology: Biotroph; phytopathogenic; growing on leaves, epiphyllous (mostly) or amphigenous. Host or Phorophyte Taxonomy: Morus alba L.; Morus, Moraceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered, .095-.115-(.13) mm in diam.. Margin: External filaments present (often abruptly bent in the upper half; width equal throughout or somewhat expanded upwards (ca. 3/4 of the stalk), then narrowing towards the apex, sometimes gradually decreasing from base to top, width of the circinate part mostly somewhat decreasing towards the tip); uncinate or circinate (when mature), 1-1.5 µm long, 5-7 µm in diameter, hyaline or faintly pigmented (sometimes at the base), numerous, 10-26 per mm², growing between the lower and upper hald of the ascocarp, flexuose or stiff and straight, smooth or faintly rough, thin or thick (towards the base), not ramified, aseptate or septate (with a single septum at the base).

Asci: (2)-3-6 asci per ascocarp, indistinctly stipitate, 45-65 µm long, 35-55 µm wide; dehiscence unitunicate.

Ascospores: 1–2, c. 4, or c. 8 per ascus, spores (2)-4-5-(6) per ascus, ellipsoid or ovoid, 18-28-(35) µm long, 11-18-(19) µm wide; septa absent.

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