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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. Data set reviewer(s): Schubert K. (06-03-29); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: variety. Synonyms: Golovinomyces mayorii var. japonica (U. Braun & Y. Nomura) V. P. Gelyuta; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Erysiphe mayorii var. japonica U. Braun & Y. Nomura. Type: Erysiphe mayorii var. japonica U. Braun & Y. Nomura.

Taxonomic Literature: Taxonomic notes: +ascocarp outer wall cells obcscure, irregularly polygonal to rounded, ca. 8-20 µm diam.;Morphologically agreeing with var. mayorii, but asci 4-7-spored. Braun U., Beih. Nova Hedwigia 89: 1-700 [179-181] (1987).

Biogeography: Continent: Asia-Temperate. Region(s): Far Eastern Asia. Country or state(s): Japan.

Ecology: Biotroph; phytopathogenic; growing on stems or leaves, amphigenous. Host or Phorophyte Taxonomy: Cirsium nipponicum (Maxim.) Makino; Cirsium, Compositae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, .085-.15 mm in diam.. Margin: External filaments present (usually shorter than the cleistothecial diam.); interwoven with surrounding mycelium, mycelioid, straight, 3.5-6.5 µm in diameter, hyaline (at first, later yellowish to brown) or pigmented, numerous, growing all across the lower half of the ascocarp, smooth or rough, thin, not ramified or ramified, often irregular, septate.

Asci: 6-30 asci per ascocarp, not stipitate or distinctly stipitate (mostly; 1: occasionally), 45-85 µm long, 20-40 µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores 4-7 per ascus, subglobose, ellipsoid, or ovoid, (11)-15-22 µm long, (6)-8-14.5 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Doliiform or cylindrical; macroconidial, not branched, 23-35 µm long, (11)-14-21 µm wide; aseptate.

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