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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. (06-03-24); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Microsphaera menispermi Howe var. menispermi; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera menispermi Howe var. menispermi. Type: Microsphaera menispermi Howe var. menispermi.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells irregularly polygonal, ca. 8-20 µm diam. Braun U., Beih. Nova Hedwigia 89: 1-700 [411-413] (1987).

Biogeography: Northern hemispheric. Continent: Northern America (USA, widespread, from the eastern to the central states, from Calif. ro O., Va., N.Y.). Country or state(s): Iowa (USA), Michigan (USA), New York (USA), Ohio (USA), California (USA), and Virginia (USA). Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on leaves, epiphyllous (mostly) or amphigenous. Host or Phorophyte Taxonomy: Menispermum canadensis L.; Menispermum, Menispermaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, (.08)-.1-.135-(.145) mm in diam.. Margin: External filaments present; recurved, .75-1-1.25 µm long, 7-10-(12) µm in diameter, hyaline or pigmented (brown at the base), numerous, (6)-8-18-(20) per mm², growing between the lower and upper hald of the ascocarp, stiff and straight, smooth, thin, moderatly thick (throughout or thin-walled above and thick-walled towards the base), or thick, ramified, dichotomously branched (4-7-times, closely and regularly, compact, occasionally somewhat looser, tips recurved), aseptate or septate (0-1-septate).

Asci: 4-8 asci per ascocarp, not stipitate or indistinctly stipitate, (35)-40-70 µm long, 25-50 µm wide; dehiscence unitunicate.

Ascospores: c. 4 to c. 8 per ascus, spores (3)-4-7-(8) per ascus, ellipsoid or ovoid, (15)-18-25 µm long, 10-14 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid or doliiform; macroconidial, not branched, 28-33 µm long, 15-16 µm wide; aseptate.

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