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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-08-02). Data set reviewer(s): Schubert K. (06-04-05); revised.

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

Type Information: Basionym: Phyllactinia corylopsidis Y. N. Yu & S. J. Han. Type: Phyllactinia corylopsidis Y. N. Yu & S. J. Han.

Ecology: Biotroph; phytopathogenic; growing on leaves, hypophyllous. Host or Phorophyte Taxonomy: Corylopsis sinensis Hemsl.; Corylopsis, Hamamelidaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered, .195-.27 mm in diam.. Margin: External filaments present (densely crowded around the ascocarp); not interlaced, straight, 1.5-2 µm long, numerous, 10-20 per mm², growing between the lower and upper hald of the ascocarp, stiff and straight, not ramified.

Asci: 7-14 asci per ascocarp, distinctly stipitate, 70-95 µm long, 25-40 µm wide; dehiscence unitunicate.

Ascospores: 1–2 per ascus, spores 2 per ascus, ellipsoid or ovoid, 24-34 µm long, 17-20 µm wide; septa absent.

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