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Data Set Maintenance: Data set compiled and standard item; reviewer(s): Schubert K. (06-03-28); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: variety. Synonyms: Microsphaera vanbruntiana var. vanbruntiana W.R. Gerard; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera vanbruntiana W. R. Gerard var. vanbruntiana. Type: Microsphaera vanbruntiana W. R. Gerard var. vanbruntiana.

Taxonomic Literature: Taxonomic notes: +conidiophores foot-cells straight, cylindric, followed by two shorter cells, sometimes by a longer and a shorter cell;+appressoria lobed;+ascomata outer wall cells irregularly polygonal, ca. 10-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [337] (1987).

Biogeography: Continent: Asia-Temperate and Northern America (USA, Canada, generally distributed). Region(s): China. Country or state(s): Japan; Nova Scotia (Canada), Ontario (Canada), Quebec (Canada), Idaho (USA), Illinois (USA), Minnesota (USA), Missouri (USA), Nebraska (USA), Wisconsin (USA), Connecticut (USA), Indiana (USA), Massachusetts (USA), Michigan (USA), New Hampshire (USA), New York (USA), Ohio (USA), Pennsylvania (USA), Vermont (USA), West Virginia (USA), California (USA), Alabama (USA), Delaware (USA), Florida (USA), Georgia (USA), Kentucky (USA), Maryland (USA), and District of Columbia (USA). Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Sambucus canadensis L.; Sambucus, Caprifoliaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, (.065)-.08-.13-(.145) mm in diam.. Margin: External filaments present; straight (not recurved, truncate or elongated, narrowed when fully mature), 1-1.5 µm long, 6.5-11.5 µm in diameter, hyaline or pigmented (sometimes at the base), few or numerous, 5-18 per mm², growing between the lower and upper hald of the ascocarp, stiff and straight, smooth or somewhat rough (below), thin or thick (towards the base), ramified, dichotomously branched (4-6 times, branchings close and regular, compact, primary and secondary branches short, the other branches deeply bifurcate, appearance of the branchings digitate, the tips of the ultimate branchlets straight, not recurved, truncate or elongated, narrowed when fully mature), aseptate or septate (0-1-septate).

Asci: (2)-3-8 asci per ascocarp, not stipitate or indistinctly stipitate, 40-70-(80) µm long, 30-50 µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores 3-6 per ascus, subglobose, ellipsoid, or ovoid, (15)-18-30 µm long, (10)-12-18 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched; basal cells 18-30 µm long, 7-11 µm wide. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid, doliiform, or cylindrical; macroconidial, not branched, 26-38 µm long, 12-20 µm wide; aseptate.

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