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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. (06-01-24); revised.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Synonyms: Microsphaera abbreviata Peck; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera abbreviata Peck. Type: Microsphaera abbreviata Peck.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells irregularly polygonal, ca. 8-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [426-427] (1987).

Biogeography: Continent: Northern America (USA: central states, from Colo. and Kans. to Wisc., eastward and southeastward to N.Y., Tenn. and N.C.). Country or state(s): Colarado (USA), Kansas (USA), Wisconsin (USA), New York (USA), North Carolina (USA), and Tennessee (USA).

Ecology: Biotroph; phytopathogenic; growing on leaves, hypophyllous or amphigenous (rarely). Host or Phorophyte Taxonomy: Quercus bicolor; Quercus, Fagaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered, .07-.11 mm in diam.. Margin: External filaments present (mostly shorter than the cleistothecial diam.); setiform, recurved (tips of the apical branches), .5-1-(1.25) µm long, 7-10 µm in diameter, hyaline or pigmented (at the base), few, 3-15 per mm², stiff and straight (and stout), smooth or rough (below), thin, moderatly thick (throughout, or thin-walled above and thick-walled towards the base), or thick, ramified, dichotomously branched (4-6 times, closely and regularly, primary branches occsionally somewhat elongated, tips recurved), aseptate or septate (0-1-septate).

Asci: 3-6 asci per ascocarp, sub-globose (often), not stipitate or indistinctly stipitate, 50-65 µm long, 35-55 µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores 3-6 per ascus, subglobose, ellipsoid, or ovoid, 20-32 µm long, 13-21 µm wide; septa absent.

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