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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-08-02). Data set reviewer(s): Schubert K. (06-04-05); revised.

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

Type Information: Basionym: Phyllactinia juglandis J. F. Tao & J. Z. Qin. Type: Phyllactinia juglandis J. F. Tao & J. Z. Qin.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells obscure, irregularly shaped, ca. 6-20 µm diam.;+ascomata penicillate cells ca. 50-60 x 8-12 µm;. Braun U., Beih. Nova Hedwigia 89: 1-700 [584] (1987).

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

Ecology: Biotroph; phytopathogenic; growing on leaves, hypophyllous. Host or Phorophyte Taxonomy: Juglans regia L.; Juglans, Juglandaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, .165-.25 mm in diam.. Margin: External filaments present (bulbous base ca. 35-45 µm diam.); not interlaced, straight, .5-1-(1.5) µm long, numerous, 8-20 per mm², growing between the lower and upper hald of the ascocarp, stiff and straight, not ramified.

Asci: 10-28 asci per ascocarp, distinctly stipitate, 50-100 µm long, 25-35 µm wide; dehiscence unitunicate.

Ascospores: 1–2 per ascus, spores 2 per ascus, ellipsoid or ovoid, 25-40 µm long, 15-26 µm wide; septa absent.

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