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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-27). Data set reviewer(s): Schubert K. (06-03-27); revised.

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

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

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells polygonal, ca. 8-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [415-416] (1987).

Biogeography: Northern hemispheric. Continent: Northern America (USA, O. to Miss., Tex., S.Dak., Ia., Calif.). Country or state(s): Illinois (USA), Iowa (USA), Minnesota (USA), Missouri (USA), Nebraska (USA), South Dakota (USA), Wisconsin (USA), Indiana (USA), New York (USA), Ohio (USA), California (USA), Utah (USA), Texas (USA), Delaware (USA), and Mississippi (USA). Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Euonymus americanus L.; Euonymus, Celastraceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, .07-.11 mm in diam.. Margin: External filaments present; circinate, sub-helicoid, or recurved (tips of the ultimate branchlets), 1-1.5-2 µm long, 6-11 µm in diameter, hyaline or pigmented (at the base), few, 4-9 per mm², growing between the lower and upper hald of the ascocarp, stiff and straight, smooth or somewhat rough (at the base), thin or thick (towards the base), ramified, dichotomously branched (3-5 times regularly, ornate, somewhat loose, primary branches sometimes elongated, tips of the ultimate branchlets recurved, sometimes circinate or subhelicoid), aseptate or septate (0-1-septate).

Asci: 2-5 asci per ascocarp, not stipitate (mostly), 35-50 µm long, 25-40 µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores 5-7 per ascus, subglobose, ellipsoid, or ovoid, 13-20 µm long, 9-13 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Sub-cylindrical; macroconidial (l/w ratio ca. 2-2.8), not branched, 30-40 µm long, 13-17 µm wide; aseptate.

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