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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. (06-03-02); revised.

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

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

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells obscure, irregularly polygonal, ca. 6-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [542] (1987).

Biogeography: Northern hemispheric. Continent: Northern America (USA, widespread). Country or state(s): Washington (USA), Illinois (USA), Kansas (USA), Missouri (USA), Wisconsin (USA), Indiana (USA), New Jersey (USA), New York (USA), Ohio (USA), West Virginia (USA), Texas (USA), Alabama (USA), Arkansas (USA), Louisiana (USA), Mississippi (USA), and District of Columbia (USA).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Celtis occidentalis L.; Celtis, 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, .085-.125 mm in diam.. Margin: External filaments present (gracile); uncinate (closely), circinate, or sub-helicoid, .5-1 µm long, 3.5-5.5 µm in diameter, hyaline, very numerous, 50-150 per mm², growing more or less between the lower and upper hald of the ascocarp, flexuose or stiff and straight, smooth, thick (lumen often nearly obliterate), not ramified, aseptate.

Asci: 5-8 asci per ascocarp, not stipitate or indistinctly stipitate, 50-65 µm long, 30-40 µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores (4)-5-6-(7) per ascus, ellipsoid or ovoid, 18-24 µm long, 10-13 µm wide; septa absent.

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