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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. (06-03-01); revised.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Synonyms: Uncinuliella flexuosa (Peck) U. Braun; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Uncinula flexuosa Peck. Type: Uncinula flexuosa Peck.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells irregularly polygonal, ca. 8-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [548-550] (1987); Steinecke, G., Merkblatt der Landesanstalt für Pflanzenschutz Stuttgart (2001).

Biogeography: Northern hemispheric. Continent: Europe and Northern America (USA: nearly allover, widespread, especially in the central and eastern states; Canada). Country or state(s): Germany and Switzerland (incl. Liechtenstein); Ontario (Canada), Idaho (USA), Illinois (USA), Iowa (USA), Kansas (USA), Missouri (USA), Connecticut (USA), Indiana (USA), Massachusetts (USA), Michigan (USA), New Jersey (USA), New York (USA), Ohio (USA), Pennsylvania (USA), Vermont (USA), West Virginia (USA), Texas (USA), Alabama (USA), Delaware (USA), Georgia (USA), Kentucky (USA), Mississippi (USA), North Carolina (USA), and District of Columbia (USA). Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Aesculus hippocastanum L.; Aesculus, Hippocastanaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, (.085)-.1-.14-(.17) mm in diam.. Margin: External filaments present (two types of appendages: long, Uncinula like appendages (see description below) and circle of short appendages, stiff, bristle-like, straight to curved, narrowed upwards, ca. 15-40 µm long, 3.5-7.5 µm wide, hyaline, aseptate, rough); circinate (undulate to helically twisted for one-quarter to one-half length below the hooked apex; closely), .5-1-1.5 µm long, 4.5-12.5 µm in diameter, hyaline or pigmented (somewhat brown at the base), numerous, (15)-25-60 per mm², growing between the lower and upper hald of the ascocarp (width increasing upards), somewhat flexuose or stiff and straight, smooth or rough (usually below), thin or thick (towards the base), not ramified, aseptate.

Asci: 5-12 asci per ascocarp, not stipitate or indistinctly stipitate, 40-65 µm long, 25-40 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores (6)-8 per ascus, ellipsoid or ovoid, 15-25 µm long, 9-13 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid or oblong-obtuse; macroconidial, not branched, 26-32 µm long, 11-16 µm wide; aseptate.

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