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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. (06-04-05); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Erysiphe japonica (S. Ito & Hara) C. T. Wei; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Typhulochaeta japonica S. Ito & Hara. Type: Typhulochaeta japonica S. Ito & Hara.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells irregularly shaped, small, ca. 5-15 µm diam., sometimes up to 25 µm in length;. Braun U., Beih. Nova Hedwigia 89: 1-700 [553-554] (1987).

Biogeography: Continent: Asia-Temperate. Region(s): China. Country or state(s): Japan and Korea (North & South).

Ecology: Biotroph; phytopathogenic; growing on leaves, hypophyllous. Host or Phorophyte Taxonomy: Quercus glandulifera Blume; Quercus, Fagaceae.

Reproduction Strategy: With sexual (and possible asexual) stages (large, ca. 130-180 µm in diam.). Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, .13-.18 mm in diam.. Margin: External filaments present (special apical cells clavate); straight, 6-9 µm in diameter, hyaline, numerous, 95-150 per mm², growing on the upper half of the ascocarp (circularly arranged), stiff and straight, smooth, thin (with a narrower central strain of mucilaginous material, these cells gelify in water and they can be ruptured at the apex to eject the mucilaginous material), not ramified, aseptate.

Asci: 5-14 asci per ascocarp, distinctly stipitate, 70-100 µm long, 30-55 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores (6)-8 per ascus, ellipsoid or ovoid, 19-36 µm long, 12-18 µm wide; septa absent.

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