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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. (06-01-26); revised.

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

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

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells irregularly polygonal to rounded, ca. 8-25 µm diam.;. Braun, U. 1987. A monograph of the Erysiphales (powdery mildews). Beih. Nova Hedwigia 89: 1-700 [407-408].

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

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Vaccinium hirtum Thunb.; Vaccinium, Ericaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, .085-.125 mm in diam.. Margin: External filaments present; setiform, recurved (tips of the ultimate branchlets), .75-1.5 µm long, 8-10 µm in diameter, hyaline, few, 3-12 per mm², growing between the lower and upper hald of the ascocarp, stiff and straight (straight to curved), smooth or rough (usually), thin or thick (towards the base), ramified, dichotomously branched (4-6 times, relatively closely and regularly, branchings sometimes looser, very rarely trichotomously branched, tips recurved) or trichotomously branched (very rarely), aseptate or septate (occasionally with a single septum at the base).

Asci: (3)-4-6-(7) asci per ascocarp, broadly clavate (mostly), not stipitate or indistinctly stipitate, (40)-45-65-(70) µm long, (25)-30-50-(55) µm wide; dehiscence unitunicate.

Ascospores: c. 4 to c. 8 per ascus, spores (3)-5-6-(7) per ascus, ellipsoid, ovoid, or sub-cylindrical (to oblong, mostly rather long and slender), (16)-18-28-(32) µm long, (8)-10-16-(20) µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid, ovoid, or sub-cylindrical; macroconidial, not branched, 30-45 µm long, 14-22 µm wide; aseptate.

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