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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Schubert K. @EXCL@ Kainz C. (06-03-20).

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

Type Information: Basionym: Sawadaea zhengii Y. Nomura. Type: Sawadaea zhengii Y. Nomura.

Taxonomic Literature: Taxonomic notes: + cleistothecia: cellulae parietis irregulariter angulatae, 10-22 × 8-16 µm. Nomura Y., Taxonomical study of Erysiphaceae of Japan. - 1-281 [106-107]. Tokyo (1997).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Acer mono [Maxim.] f. dissectum Rehd.; Acer, Aceraceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid (atro-brunnea), orbicular (globosa vel spheroidea), scattered or gregarious, .13-.18 mm in diam.. Margin: External filaments present; helicoid, 70-175 µm long, 8-12 µm in diameter, hyaline, numerous, 50-80 per mm², growing on the upper half of the ascocarp (coronatae), not ramified or ramified (prope basim), dichotomously branched (1/3 vel inferiore 1-2(-3) dichotome ramulosae), aseptate.

Asci: 10-15 asci per ascocarp, globose, distinctly stipitate, 62-83 µm long, 35-44 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 6-8-8 per ascus, ellipsoid, 12.5-26 µm long, 10-14 µm wide; septa absent.

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