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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. (06-05-19); revised.

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

Taxonomic Literature: Taxonomic notes: +ascoc. outer wall cells obscure, irregularly polygonal to rounded, ca. 6-15 mm diam.;+ascoc. ext. fil. shorter than the ascoc. diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [110] (1987).

Biogeography: Northern hemispheric. Continent: Europe. Country or state(s): Austria, Germany, Switzerland (incl. Liechtenstein), France (excl. Corsica), and Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia).

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

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered, .05-.065 mm in diam.. Margin: External filaments present; mycelioid (narrow), straight, 2.5-5 µm in diameter, hyaline or pigmented (yellowish or faintly brown), few or numerous, growing all across the lower half of the ascocarp, thin, not ramified, septate.

Asci: 1 asci per ascocarp, sub globose or broadly clavate, not stipitate, 45-60 µm long, 40-60 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 8 per ascus, ellipsoid or ovoid, 17-24 µm long, 9.5-16 µm wide; septa absent.

Conidiophores: Euoidium-type; not branched. Conidium Formation: Conidiogenous cells in chains. Conidia: Macroconidial, not branched; aseptate; with distintly visible fibrosin body fibrosin bodies.

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