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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. (06-02-28); revised.

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

Type Information: Basionym: Uncinula bifurcata Homma. Type: Uncinula bifurcata Homma.

Taxonomic Literature: Taxonomic notes: +conidiophores foot-cells followed by 1-2 shorter cells;+ascomata outer wall cells polygonal, ca. 10-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [519-520] (1987).

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

Ecology: Biotroph; phytopathogenic; growing on leaves, epiphyllous (mostly) or amphigenous. Host or Phorophyte Taxonomy: Quercus serrata Thunb.; Quercus, Fagaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, .085-.125 mm in diam.. Margin: External filaments present (straight to curved); uncinate or circinate, 1-1.2 µm long, 5-10 µm in diameter, hyaline or pigmented (at the base), few, 6-16 per mm², growing between the lower and upper hald of the ascocarp, stiff and straight (rather), smooth or rough, thin or thick (towards the base), ramified (frequently forked in the lower half), aseptate or septate (0-1-septate).

Asci: 5-8 asci per ascocarp, not stipitate or indistinctly stipitate, 50-70 µm long, 30-40 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 6-8 per ascus, ellipsoid or ovoid, 15-22 µm long, 10-15 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Cylindrical; macroconidial, not branched, 25-33 µm long, 14-16 µm wide; aseptate.

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