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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Schubert K. @EXCL@ Kainz C. (06-01-30).

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

Type Information: Basionym: Microsphaera shinanoensis Tanda. Type: Microsphaera shinanoensis Tanda.

Taxonomic Literature: Taxonomic notes: ascomata wall cells irregularly polygonal, 11-21 × 7-14 µm. Tanda S., Mycoscience 35: 49-52 (1994).

Biogeography: Continent: Asia-Temperate. Country or state(s): Japan (Nagano Pref.).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Viburnum opulus var. calvescentus Hara; Viburnum, Caprifoliaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular (globose or subglobose), forming independently from the host thallus or mycelium, scattered, (.071)-.078-.088-(.099) mm in diam.. Margin: External filaments present; mycelioid or setiform, straight (apex of the ultimate branches), (113)-141-205-(226) µm long, 4.1-7.9 µm in diameter, hyaline or pigmented (hyaline throughout or light brown at the base), few, 3-10 per mm², growing between the lower and upper hald of the ascocarp, flexuose, thin, ramified ((3-)4-6 times branched), dichotomously branched or irregular, usually aseptate or septate (rarely 1-septate).

Asci: 3 asci per ascocarp, globose (subglobose or broadely ovate), not stipitate or indistinctly stipitate, 42-56 µm long, 32-46 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 6-8 per ascus, ellipsoid or ovoid, 17-20 µm long, 10-12 µm wide; wall remaining hyaline, hyaline.

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