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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. (06-03-02); revised.

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

Type Information: Basionym: Uncinula nankinensis F. L. Tai. Type: Uncinula nankinensis F. L. Tai.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells distinct, irregularly polygonal, ca. 5-17 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [522-523] (1987).

Ecology: Biotroph; phytopathogenic; growing on leaves, hypophyllous or amphigenous (rarely). Host or Phorophyte Taxonomy: Acer trifidum Hook. & Arn.; Acer, Aceraceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular (globose-lenticular, later basal part concave), forming independently from the host thallus or mycelium, scattered or in loose groups, (.15)-.195-.27-(.31) mm in diam.. Margin: External filaments present (straight to curved); uncinate or circinate, .3-.8-(1) µm long, 5-7.5-(9) µm in diameter, hyaline, very numerous, 120-170 per mm², growing sub-between the lower and upper hald of the ascocarp, smooth, thin or thick (towards the base), not ramified, aseptate.

Asci: (22)-28-32-(37) asci per ascocarp, not stipitate (rarely) or distinctly stipitate, (50)-70-90-(105) µm long, (25)-28.5-38-(43) µm wide; dehiscence unitunicate.

Ascospores: c. 8 (22.8-34.2 x 11.4-19 µm according to Tai's description) per ascus, spores 8 per ascus, ovoid (oblong-), (12.5)-17.5-23 µm long, (9)-10-14-(16) µm wide; septa absent.

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