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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-26). Data set reviewer(s): Schubert K. (06-03-28); revised.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Synonyms: Microsphaera yamadai (E. S. Salmon) Syd.; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera alni var. yamadai E. S. Salmon. Type: Microsphaera alni var. yamadai E. S. Salmon.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells obscure, polygonal to rounded, ca. 10-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [375] (1987).

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

Ecology: Biotroph; phytopathogenic; growing on leaves. Host or Phorophyte Taxonomy: Hovenia dulcis Thunb.; Hovenia, Rhamnaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered, .075-.105 mm in diam.. Margin: External filaments present; sub-helicoid or recurved (3+4 tips of the ultimate branchlets), 1-2 µm long, 7-10 µm in diameter, hyaline or pigmented (brown at the very base), few or numerous, 4-15 per mm², growing between the lower and upper hald of the ascocarp, stiff and straight (and curved), smooth, thin or thick (towards the base), ramified, dichotomously branched (1-3 times, widely forked, primary branches usually elongated, tips recurved to subhelicoid), aseptate or septate (0-1-septate).

Asci: 4-6 asci per ascocarp, not stipitate (mostly), 40-60 µm long, 30-45 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 6-8 per ascus, ellipsoid or ovoid, 15-22.5 µm long, 10-13 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: More or less ellipsoid; macroconidial, not branched, 35-40 µm long, 15-18 µm wide; aseptate.

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