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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. Data set reviewer(s): Schubert K. (06-05-17); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Sphaerotheca macularis f. pruinosa (Cooke & Peck) Jacz.; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Taxonomic Literature: Taxonomic notes: +conidiophores rather narrow, ca. 8-9 µm wide;+ascoc. outer wall cells polygonal to irregular, ca. 8-20(-25) µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [117-118] (1987).

Biogeography: Northern hemispheric. Continent: Northern America (Mexico, USA, Canada). Country or state(s): Ontario (Canada), Quebec (Canada), Colarado (USA), Idaho (USA), Illinois (USA), Missouri (USA), Wisconsin (USA), Connecticut (USA), Indiana (USA), Massachusetts (USA), Michigan (USA), Ohio (USA), Pennsylvania (USA), Vermont (USA), Florida (USA), Georgia (USA), Maryland (USA), and Mississippi (USA). Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on stems or leaves, amphigenous. Host or Phorophyte Taxonomy: Rhus glabra L.; Rhus, Anacardiaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, .07-.095 mm in diam.. Margin: External filaments present; interlaced with each other, mycelioid (contorted, characteristically undulate or twisted), straight, 1-6 µm long, 3.5-7 µm in diameter, hyaline or faintly pigmented (sometimes, brownish below, paler above), numerous, growing all across the lower half of the ascocarp, flexuose, smooth, thin or moderatly thick, not ramified, septate (few inconspicuous septa).

Asci: 1 asci per ascocarp, sub-globose (mostly), not stipitate, 60-80 µm long, 50-70 µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores (4)-6-8 per ascus, ellipsoid, 16-25 µm long, 10-15 µm wide; septa absent.

Conidiophores: Euoidium-type; not branched; basal cells 80-100 µm long, 11-15 µm wide. Conidium Formation: Conidiogenous cells in chains. Conidia: Ovoid or cylindrical; macroconidial, not branched, 20-28 µm long, 14-16 µm wide; aseptate; with distintly visible fibrosin body fibrosin bodies.

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