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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 clintonii Peck. Type: Uncinula clintonii Peck.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells obscure, irregularly polygonal, ca. 5-22.5 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [499-500] (1987).

Biogeography: Continent: Northern America (USA, Canada, generally distributed). Country or state(s): Ontario (Canada), Quebec (Canada), Illinois (USA), Iowa (USA), Minnesota (USA), North Dakota (USA), Wisconsin (USA), Connecticut (USA), Indiana (USA), Michigan (USA), New Hampshire (USA), New York (USA), Ohio (USA), Pennsylvania (USA), Vermont (USA), Florida (USA), and Mississippi (USA). Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Tilia americana L.; Tilia, Tiliaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, .09-.185 mm in diam.. Margin: External filaments present (width increasing upwards, hooked part conspicuously enlarged); uncinate (closely), circinate, or sub-helicoid, .75-2 µm long, 5-7.5-(14) µm in diameter, hyaline or pigmented (at the very base, brown), numerous, 15-40 per mm², growing somewhat all across the lower half of the ascocarp or between the lower and upper hald of the ascocarp, flexuose (or straight to curved, mostly somewhat flexuous), smooth or rough (below), thin or thick (towards the base), not ramified, aseptate or septate (with a single septum at the base).

Asci: 3-10 asci per ascocarp, not stipitate or indistinctly stipitate, (35)-40-60 µm long, 25-45 µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores 4-6 per ascus, ellipsoid or ovoid, (16)-20-25 µm long, (8)-10-14-(17) µm wide; septa absent.

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