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Data Set Maintenance: Data set compiled and standard item; reviewer(s): Schubert K. (06-01-26); revised.

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

Type Information: Basionym: Microsphaera symphoricarpi Howe. Type: Microsphaera symphoricarpi Howe.

Taxonomic Literature: Taxonomic notes: +ascocarp outer wall cells conspicuous, irregularly polygonal, ca. 10-25(-30) µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [323] (1987).

Biogeography: Northern hemispheric. Continent: Northern America (USA, Canada, generally distributed). Country or state(s): British Columbia (Canada), Ontario (Canada), Idaho (USA), Montana (USA), Oregon (USA), Washington (USA), Wyoming (USA), Illinois (USA), Iowa (USA), Kansas (USA), Minnesota (USA), Missouri (USA), North Dakota (USA), Nebraska (USA), Oklahoma (USA), South Dakota (USA), Wisconsin (USA), Connecticut (USA), Indiana (USA), New York (USA), Ohio (USA), Pennsylvania (USA), Vermont (USA), West Virginia (USA), California (USA), Utah (USA), New Mexico (USA), Texas (USA), Mississippi (USA), and Virginia (USA). Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Symphoricarpos sp.; Symphoricarpos, 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, .06-.11-(.13) mm in diam.. Margin: External filaments present (horizontally spread, long appendages sometimes with a tendency to turn towards one direction); mycelioid or setiform (intermediary), straight (tips of the ultimate branchlets not recurved), (1.5)-2-5-(7) µm long, 5-10 µm in diameter, hyaline or pigmented (sometimes at the very base), few or numerous, 4-20 per mm², growing between the lower and upper hald of the ascocarp, flexuose (and long), smooth or faintly rough, thin or thick (towards the base), not ramified or ramified, dichotomously branched (2-6 times, branchings diffuse, tips not recurved, development of the branchings rather late, frequently not fully developed), aseptate or septate (a single septum at the base).

Asci: 4-10 asci per ascocarp, not stipitate or indistinctly stipitate, 35-60 µm long, 25-40-(50) µm wide; dehiscence unitunicate.

Ascospores: 1–2, c. 4, or c. 8 per ascus, spores (2)-3-5-(6) per ascus, subglobose, ellipsoid, or ovoid, 14-23 µm long, 8-14 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid, doliiform, or nearly cylindrical (sometimes); macroconidial, not branched, 26-35 µm long, 13-20 µm wide; aseptate.

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