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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-28). Data set reviewer(s): Schubert K. (06-03-01); revised.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: variety. Synonyms: Uncinula kusanoi var. zelkowae (Henn.) U. Braun; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Uncinula zelkowae Henn. Type: Uncinula zelkowae Henn.

Taxonomic Literature: Taxonomic notes: This variety differs from the other varieties by ascomata characters, see below.+ascomata outer wall cells 10-25 µm in diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [496-499] (1987).

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

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Zelkova serrata Makino; Zelkova, Ulmaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, .08-.125 mm in diam.. Margin: External filaments present (width increasing from base to top, the apex is strongly and abruptly enlarged); circinate or sub-helicoid, .5-1.5 µm long, numerous, 15-25 per mm², growing between the lower and upper hald of the ascocarp, flexuose (mostly somewhat) or stiff and straight, smooth or rough, thin or thick (towards the base), not ramified, aseptate.

Asci: 2-5 asci per ascocarp, indistinctly stipitate, 50-55 µm long, 30-50 µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores 3-6 per ascus, ellipsoid or ovoid, 19-28 µm long, 12-15 µm wide; septa absent.

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