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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. (06-02-22); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Erysiphe hommae (U. Braun) U. Braun & S. Takam.; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera hommae U. Braun. Type: Microsphaera hommae U. Braun.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells polygonal to rounded, ca. 10-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [384-385] (1987).

Biogeography: Continent: Asia-Temperate and Northern America (USA, Canada). Region(s): Far Eastern Asia and China. Country or state(s): Japan.

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Corylus heterophylla Fisch. ex Bess.; Corylus, Corylaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, (.07)-.08-.105-(.115) mm in diam.. Margin: External filaments present; recurved (tips of the ultimate branchlets), .5-1-1.5 µm long, 6-9 µm in diameter, hyaline or pigmented (brown at the base, septum occasionally somewhat away from the base and colour reaching the middle of the stalk), few, 4-15 per mm², growing between the lower and upper hald of the ascocarp, stiff and straight (straight to curved), smooth or rough, thin or thick (throughout or thin-walled above and thick-walled towards the base), ramified, dichotomously branched (3-5 times, closely and regularly, tips recurved, rarely some appendages deeply cleft), aseptate or septate (a single septum at the base).

Asci: 3-5 asci per ascocarp, not stipitate (mostly), 40-55 µm long, 30-50 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 6-8 per ascus, subglobose, ellipsoid, or ovoid, 14-20 µm long, 8-13 µm wide; septa absent.

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