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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 or basionymous. Taxonomic rank: species. Synonyms: Uncinula intermedia Berk. & M. A. Curtis; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Uncinula macrospora Peck. Type: Uncinula macrospora Peck.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells obscure, polygonal, ca. 8-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [521] (1987).

Biogeography: Northern hemispheric. Continent: Northern America (USA, Canada, widespread). Country or state(s): Illinois (USA), Iowa (USA), Kansas (USA), Minnesota (USA), Missouri (USA), North Dakota (USA), Nebraska (USA), Wisconsin (USA), Connecticut (USA), Indiana (USA), Massachusetts (USA), Michigan (USA), New York (USA), Ohio (USA), West Virginia (USA), Texas (USA), Florida (USA), Louisiana (USA), Mississippi (USA), North Carolina (USA), South Carolina (USA), Tennessee (USA), Virginia (USA), and District of Columbia (USA).

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

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, (.095)-.12-.17-(.19) mm in diam.. Margin: External filaments present (length variable; occasionally slightly expanded upwards); uncinate (closely, rarely subhelicoid), circinate, or sub-helicoid, .5-1-(1.25) µm long, (3)-4.5-7.5 µm in diameter, hyaline, numerous, 45-80-(120) per mm², growing more or less between the lower and upper hald of the ascocarp, flexuose or stiff and straight, smooth or somewhat rough (below), thin or moderatly thick (throughout, somewhat thin-walled above), not ramified, aseptate or septate (rarely with a single septum at the base).

Asci: 8-25 asci per ascocarp, not stipitate or indistinctly stipitate, 45-85 µm long, 25-40 µm wide; dehiscence unitunicate.

Ascospores: 1–2 per ascus, spores 2 per ascus, ellipsoid or ovoid, 24-40 µm long, 13-21 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Doliiform or cylindrical; macroconidial, not branched, 30-40 µm long, 15-18 µm wide; aseptate.

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