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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. (06-02-28); revised.

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

Type Information: Basionym: Uncinula circinata Cooke & Peck. Type: Uncinula circinata Cooke & Peck.

Taxonomic Literature: Taxonomic notes: +ascocarp outer wall cells obscure, irregularly polygonal, ca. 8-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [475-476] (1987).

Biogeography: Northern hemispheric. Continent: Northern America (USA: Me., N.Y., N.H. to Ala., Tex., Mich., Mo., Ia.; Canada). Country or state(s): Ontario (Canada), Quebec (Canada), Illinois (USA), Iowa (USA), Kansas (USA), Missouri (USA), Wisconsin (USA), Connecticut (USA), Indiana (USA), Maine (USA), Massachusetts (USA), Michigan (USA), New Hampshire (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), Maryland (USA), Mississippi (USA), North Carolina (USA), Tennessee (USA), Virginia (USA), and District of Columbia (USA). Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on leaves, hypophyllous (mostly) or amphigenous. Host or Phorophyte Taxonomy: Acer spicatum Lam.; Acer, Aceraceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, .115-.225 mm in diam.. Margin: External filaments present; uncinate or circinate (relatively close), .3-1 µm long, 4-7 µm in diameter, hyaline, numerous, 90-170 per mm², growing all across the lower half of the ascocarp, flexuose or stiff and straight, smooth, thin, not ramified or ramified (occasionally forked), aseptate.

Asci: 10-30 asci per ascocarp, not stipitate or distinctly stipitate, 45-85 µm long, 25-45 µm wide; dehiscence unitunicate.

Ascospores: c. 4 to c. 8 per ascus, spores (4)-6-8 per ascus, ellipsoid or ovoid, 14-32 µm long, 8-16 µm wide; septa absent.

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