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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-31). Data set reviewer(s): Schubert K. (06-04-05); revised.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Uncinula koelreuteriae I. Miyake. Type: Uncinula koelreuteriae I. Miyake.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells irregularly polygonal, ca. 5-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [554] (1987).

Ecology: Biotroph; phytopathogenic; growing on leaves, hypophyllous (mostly) or amphigenous. Host or Phorophyte Taxonomy: Koelreuteria sp.; Koelreuteria, Sapindaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered, (.135)-.15-.2-(.235) mm in diam.. Margin: External filaments present (special apical cells); recurved (apex sometimes hooked, these cells may gelify in water or they may eject mucilaginous material) or straight, .2 µm long, 9-13-(15) µm in diameter, hyaline, numerous, 40-150 per mm², growing on the upper half of the ascocarp, stiff and straight (substraigth), smooth, thin, not ramified or ramified (seldom forked), aseptate or septate (rarely with a single septum).

Asci: (10)-14-20-(24) asci per ascocarp, not stipitate or indistinctly stipitate, 50-85 µm long, 30-50 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 8 per ascus, subglobose, ellipsoid, or ovoid, 18-24 µm long, 13-18 µm wide; septa absent.

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