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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-27). Data set reviewer(s): Schubert K. (06-03-01); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Uncinula hydrangeae Y. Nomura & Tanda; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Uncinula hydrangeae Z. X. Chen & R. X. Gao. Type: Uncinula hydrangeae Z. X. Chen & R. X. Gao.

Taxonomic Literature: Taxonomic notes: +conidiophores foot-cells cylindric, long, followed by two shorter cells;+ascocarp outer wall cells irregularly polygonal, ca. 8-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [458-459] (1987).

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

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Hydrangea paniculata Siebold; Hydrangea, Hydrangeaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, in loose groups or gregarious, .085-.14 mm in diam.. Margin: External filaments present (width variable, irregular); mycelioid (mostly rather irregular, with constrictions and collapsed segments, occasionally more regular), uncinate (loosely), circinate, or helicoid (sub-), 1-4 µm long, 4-11 µm in diameter, hyaline or pigmented (later in the lower half, yellowish to brown, paler above), few or numerous, 8-40 per mm², growing between the lower and upper hald of the ascocarp, flexuose or geniculate (bent) (to undulate), smooth or rough, thin or moderatly thick (occasionally below), not ramified, aseptate or septate (0-9(-12)-septate).

Asci: 5-12 asci per ascocarp, indistinctly stipitate (mostly), 45-70 µm long, 25-50 µm wide; dehiscence unitunicate.

Ascospores: c. 4 to c. 8 per ascus, spores 3-8 per ascus, ellipsoid or ovoid, 14-28 µm long, 8-17 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid or ovoid; macroconidial (germ tubes terminal, short, with lobed appressorium), not branched, 28-43 µm long, 15-22 µm wide; aseptate.

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