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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. (06-03-22); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Currently accepted name Microsphaera calocladophora G. F. Atk. Synonyms: Microsphaera calocladophora G. F. Atk.; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera calocladophora G. F. Atk. Type: Microsphaera calocladophora G. F. Atk.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells irregularly polygonal to rounded, ca. 8-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [377] (1987).

Biogeography: Northern hemispheric. Continent: Northern America (USA, southern states, Ala., Ariz., Ark., Fla., S.C., also recorded from Ind.). Country or state(s): Indiana (USA), Arizona (USA), Alabama (USA), Arkansas (USA), Florida (USA), South Carolina (USA), and Tennessee (USA). Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on leaves, epiphyllous (mostly) or amphigenous. Host or Phorophyte Taxonomy: Quercus aquatica Walter; Quercus, Fagaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, .09-.15 mm in diam.. Margin: External filaments present; recurved, 1-1.5-(2) µm long, 6-11 µm in diameter, hyaline or pigmented (occasionally at the very base), numerous, 5-20-(28) per mm², growing between the lower and upper hald of the ascocarp, stiff and straight, smooth or faintly rough, thin, moderatly thick (throughout or thin-walled above and thick-walled below), or thick, ramified, dichotomously branched or trichotomously branched (4-6 times, closely and regularly branched, a varying percentage dichotomously branched, primary branches sometimes elongated, main axis growing on and bearing sets of opposite branches which sometimes show the same axial elongation), aseptate or septate (0-1-septate).

Asci: 4-6 asci per ascocarp, not stipitate or indistinctly stipitate, 45-75 µm long, 30-55 µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores 4-6-8 per ascus, subglobose, ellipsoid, or ovoid, 18-28 µm long, 11-17 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Cylindrical; macroconidial, not branched, 40 µm long, 15 µm wide; aseptate.

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