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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 ravenelii Berk.; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera ravenelii Berk. Type: Microsphaera ravenelii Berk.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells polygonal, obscure, about 10-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [395-396] (1987).

Biogeography: Northern hemispheric. Continent: Northern America (USA, widespread). Country or state(s): Illinois (USA), Missouri (USA), Oklahoma (USA), Indiana (USA), Ohio (USA), Florida (USA), Georgia (USA), Mississippi (USA), South Carolina (USA), and Tennessee (USA). Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Gleditschia triacanthos L.; Gleditschia, Leguminosae-Papilionoideae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, .09-.135 mm in diam.. Margin: External filaments present; not interlaced, recurved (distinctly), 1-2.5 µm long, 5-10 µm in diameter, hyaline or pigmented (at the base), numerous, 6-25 per mm², growing between the lower and upper hald of the ascocarp, flexuose or stiff and straight, smooth or rough (sometimes at the base), thin or thick (towards the base), ramified, dichotomously branched (4-5 times regularly and closely, primary branches often somewhat elongated, tips distinctly recurved), aseptate or septate (a single septum at the base).

Asci: 4-12 asci per ascocarp, not stipitate or indistinctly stipitate, 40-65 µm long, 30-50 µm wide; dehiscence unitunicate.

Ascospores: c. 4 to c. 8 per ascus, spores 3-6 per ascus, subglobose, ellipsoid, or ovoid, 14-24 µm long, 8-14 µm wide; septa absent.

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