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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. (06-03-23); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: variety. Synonyms: Microsphaera extensa var. curta U. Braun; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera extensa var. curta U. Braun. Type: Microsphaera extensa var. curta U. Braun.

Taxonomic Literature: Taxonomic notes: This variety differs from var. extensa by ascomata characters, see below. Braun U., Beih. Nova Hedwigia 89: 1-700 [358-359] (1987).

Biogeography: Continent: Northern America (USA, Canada). Country or state(s): Illinois (USA) and Alabama (USA).

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

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, .08-.15 mm in diam.. Margin: External filaments absent (straight to curved) or present; recurved, 1-2.5 µm long, 8-10 µm in diameter, hyaline, few, 5-15 per mm², growing between the lower and upper hald of the ascocarp, more or less stiff and straight (straight to curved), smooth or rough, thin, ramified (apex 3-6 times closely and regularly branched), dichotomously branched, aseptate or septate.

Asci: 3-10 asci per ascocarp, indistinctly stipitate, 50-65 µm long, 35-50 µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores (3)-5-6-(8) per ascus, subglobose, ellipsoid, or ovoid, 20-28 µm long, 11-18 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Cylindrical; macroconidial, not branched; aseptate.

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