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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. (06-03-27); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Microsphaera semitosta Berk. & M. A. Curtis ex Cooke & Peck; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera semitosta Berk. & M. A. Curtis ex Cooke & Peck. Type: Microsphaera semitosta Berk. & M. A. Curtis ex Cooke & Peck.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells irregularly polygonal, ca. 10-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [372-374] (1987).

Biogeography: Northern hemispheric. Continent: Northern America (Canada, USA, widespread). Country or state(s): Indiana (USA), New Hampshire (USA), and Florida (USA). Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on leaves. Host or Phorophyte Taxonomy: Cephalanthus occidentalis Lour.; Cephalanthus, Rubiaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, .07-.115 mm in diam.. Margin: External filaments present; recurved (at least partly) or straight, .75-2 µm long, 6-10 µm in diameter, hyaline (rarely, in the upper half) or pigmented (colour mostly reaching the branched per), few or numerous, 4-18 per mm², growing between the lower and upper hald of the ascocarp, stiff and straight, smooth, thin or moderatly thick (towards the base), ramified, dichotomously branched (3-4 times, branchings fairly loose, primary branches elongated), septate (1-4-septate, septa sometimse reaching the upper half of the stalk).

Asci: 3-7 asci per ascocarp, not stipitate or indistinctly stipitate, 40-55 µm long, 30-45 µm wide; dehiscence unitunicate.

Ascospores: c. 4 to c. 8 per ascus, spores 3-5 per ascus, ellipsoid or ovoid, (15)-18-25 µm long, 9-14 µm wide; septa absent.

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