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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. Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Uncinula chionanthi R. Y. Zheng & G. Q. Chen. Type: Uncinula chionanthi R. Y. Zheng & G. Q. Chen.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells irregularly polygonal, ca. 7.6-17.8 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [540] (1987).

Biogeography: Continent: Asia-Temperate and Europe. Region(s): China (only known from the type collection).

Ecology: Biotroph; phytopathogenic; growing on leaves, epiphyllous (mostly) or amphigenous. Host or Phorophyte Taxonomy: Chionanthus retusus Lindl. & Paxt.; Chionanthus, Oleaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, gregarious, .085-.12 mm in diam.. Margin: External filaments present (straight, seldom curved, rarely slightly nodulose, width increasing upwards, but narrowing towards the circinate apex); uncinate (close) or circinate, 1 µm long, (5)-7-9-(12.7) µm in diameter, hyaline, numerous, 12-15 per mm², growing between the lower and upper hald of the ascocarp, distinctly verrucose, moderatly thick (above, mostly coalescent near the base) or thick, not ramified, aseptate.

Asci: 4-6-(8) asci per ascocarp, not stipitate or indistinctly stipitate, 50-70 µm long, 30-55 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 5-8 per ascus, ovoid (oblong-), 15-21.5 µm long, 10.5-14 µm wide; septa absent.

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