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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-26). Data set reviewer(s): Schubert K. (06-03-24); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Microsphaera neglecta U. Braun; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera neglecta U. Braun. Type: Microsphaera neglecta U. Braun.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells obscure, irregularly polygonal, ca. 10-15 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [408-409] (1987).

Biogeography: Northern hemispheric. Continent: Northern America (USA: central states, Ia., Ill., Mo., Miss. to O.). Country or state(s): Illinois (USA), Iowa (USA), Missouri (USA), Ohio (USA), Georgia (USA), and Mississippi (USA). Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on leaves, epiphyllous (mostly) or 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 in loose groups, .065-.1 mm in diam.. Margin: External filaments present; recurved (distinctly), 1-1.5 µm long, 5-8 µm in diameter, hyaline or pigmented (at the base), few, 5-12 per mm², growing more or less between the lower and upper hald of the ascocarp, flexuose (and curved), thin, moderatly thick (throughout ot thin walled above and thick-walled towards the base), or thick, ramified, dichotomously branched (4-5 times regularly, branchings close, compact, tips distinctly recurved), aseptate or septate (0-1-septate).

Asci: 3-6 asci per ascocarp, not stipitate (mostly), 40-50 µm long, 30-40 µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores 6-7 per ascus, ellipsoid or ovoid, 15-19 µm long, 10-12 µm wide; septa absent.

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