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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. Taxonomic rank: species. Synonyms: Sphaerotheca fuliginea f. polemonii Jacz.; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Taxonomic Literature: Taxonomic notes: +ascoc. outer wall cells irregularly polygonal, about 10-25(-30) µm diam.;+ascom. ext. fil. curving towards the substrate;. Braun U., Beih. Nova Hedwigia 89: 1-700 [122-123] (1987); Braun U., The powdery mildews (Erysiphales) of Europe.- 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Asia-Temperate and Europe. Region(s): Siberia, Far Eastern Asia, and China. Country or state(s): Sweden, Poland, Belarus, Baltic States (Estonia, Lithuania, Latvia), and Ukraine; Japan.

Ecology: Biotroph; phytopathogenic; growing on stems, leaves, or petioles, amphigenous (infections very conspicuous). Host or Phorophyte Taxonomy: Polemonium coeruleum L.; Polemonium, Polemoniaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, in loose groups or gregarious (dense, often forming dark patches), .065-.1-(.11) mm in diam.. Margin: External filaments present; setiform (coarse, not mycelioid), straight, (1)-3-6 µm long, 6-10 µm in diameter, pigmented (brown throughout or paler to hyaline in the upper half, if very long), few or numerous, growing between the lower and upper hald of the ascocarp or on the upper half of the ascocarp, flexuose, smooth or faintly rough, thin or moderatly thick (at least near the base), not ramified, septate.

Asci: 1 asci per ascocarp, not stipitate, 60-85 µm long, 40-65 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 6-8 per ascus, ellipsoid or ovoid, 16-24-(30) µm long, 10-16 µm wide; septa absent.

Conidiophores: Euoidium-type; not branched. Conidium Formation: Conidiogenous cells in chains. Conidia: Macroconidial, not branched, 25-30 µm long, 14-17 µm wide; aseptate; with distintly visible fibrosin body fibrosin bodies.

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