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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. (06-03-01); revised.

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

Type Information: Basionym: Uncinula fraxini Miyabe. Type: Uncinula fraxini Miyabe.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells polygonal to rounded, ca. 8-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [524-525] (1987).

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

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Fraxinus longicuspis Siebold & Zucc.; Fraxinus, Oleaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, (.07)-.075-.115 mm in diam.. Margin: External filaments present; circinate or sub-helicoid, 1-2.5 µm long, 4-8.5 µm in diameter, hyaline or pigmented (at the base), numerous, (10)-15-35 per mm², growing between the lower and upper hald of the ascocarp, flexuose or stiff and straight, smooth, thin or moderatly thick (occasionally towards the base), not ramified, aseptate or septate (with a single septum near the base).

Asci: 4-8 asci per ascocarp, indistinctly stipitate, 40-55-(60) µm long, 25-45 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 8 per ascus, ellipsoid or ovoid, 15-20 µm long, 8-11 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched (straigth, cylindrical); basal cells 7-9 µm wide. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid or cylindrical; macroconidial, not branched; aseptate.

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