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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.; revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Sphaerotheca volkartii S. Blumer; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Taxonomic Literature: Taxonomic notes: +acomata outer wall cells irregularly polygonal, 6-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [110] (1987).

Biogeography: Northern hemispheric. Continent: Europe. Country or state(s): Finland, United Kingdom, Sweden, Poland, Switzerland (incl. Liechtenstein), Romania, and Former Yugoslavia [incl. Bosnia and Herzegovina, Croatia, Macedonia, Moldova, Serbia and Montenegro, Slovenia].

Ecology: Biotroph; phytopathogenic; growing on leaves, hypophyllous (mycelium and conidial state scarce and inconspicuous). Host or Phorophyte Taxonomy: Dryas octopetala L.; Dryas, Rosaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, not emerging (in the dense tomentum of the host leaves), scattered or gregarious, .065-.095 mm in diam.. Margin: External filaments absent or present (very short and often rudimentary); mycelioid, straight, 4-7 µm in diameter, hyaline or faintly pigmented, few (absent or only few), thin, not ramified, aseptate (or with few septa).

Asci: 1 asci per ascocarp, globose, not stipitate, 60-90 µm long, 50-70 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 8 per ascus, subglobose, broadly ellipsoid, or ovoid, 16-21 µm long, 13-18 µm wide; septa absent.

Conidiomata: Present; hyphomycetous (conidial state scarce and inconspicuous).

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