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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. (06-03-24); revised.

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

Type Information: Basionym: Microsphaera orixae U. Braun & Tanda. Type: Microsphaera orixae U. Braun & Tanda.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells obscure, irregularly polygonal, ca. 8-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [405-406] (1987).

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

Ecology: Biotroph; phytopathogenic; growing on leaves, epiphyllous (mostly) or amphigenous. Host or Phorophyte Taxonomy: Orixa japonica Thunb.; Orixa, Rutaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, (.06)-.075-.1-(.11) mm in diam.. Margin: External filaments present (ca. 65-135 µm long); recurved (distinctly, when mature), 1-1.5 µm long, 6-11 µm in diameter, hyaline or pigmented (in the lower half), few or numerous, (3)-5-18 per mm², growing between the lower and upper hald of the ascocarp, stiff and straight (and straight), smooth or rough, thin, moderatly thick (throughout or thin-walled above and thick-walled towards the base), or thick, ramified, dichotomously branched ((3-)4-5(-6) times regularly, somewhat loose, tips distinctly recurved when mature), aseptate or septate (0-2(-4)-septate).

Asci: 2-5 asci per ascocarp, broadly clavate (mostly rather broad, often subglobose), not stipitate or indistinctly stipitate, 40-65 µm long, 30-50 µm wide; dehiscence unitunicate.

Ascospores: c. 4 to c. 8 per ascus, spores (3)-4-5-(6) per ascus, ellipsoid or ovoid, 14-25.5 µm long, 8-14 µm wide; septa absent.

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