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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. (06-03-23); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Microsphaera itoana Y. Nomura, Tanda & U. Braun; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera itoana Y. Nomura, Tanda & U. Braun. Type: Microsphaera itoana Y. Nomura, Tanda & U. Braun.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells irregularly polygonal, ca. 9-17 x 6-14 µm;. Braun U., Beih. Nova Hedwigia 89: 1-700 [406] (1987).

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

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Atractylodes japonica Koidz.; Atractylodes, Compositae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered, .09-.115 mm in diam.. Margin: External filaments present (95-160 µm long); distinctly recurved, 1-1.5 µm long, hyaline, few, 5-7 per mm², growing between the lower and upper hald of the ascocarp, stiff and straight (rather), thin or moderatly thick (towards the base), ramified, dichotomously branched (3-5 times, branchings regular, somewhat loose, tips distinctly recurved), aseptate.

Asci: 6-7 asci per ascocarp, indistinctly stipitate, 50-55 µm long, 33-40 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 6 per ascus, ellipsoid or ovoid, 16-18 µm long, 6-12 µm wide; septa absent.

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