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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. Data set revised.

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

Taxonomic Literature: Taxonomic notes: +ascom. outer wall cells irregularly shaped, ca. 8-30 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [121-122] (1987); Braun U., The powdery mildews (Erysiphales) of Europe.- 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Asia-Temperate and Europe (Poland, USSR). Region(s): China. Country or state(s): Poland, Bulgaria, Belarus, Baltic States (Estonia, Lithuania, Latvia), and Ukraine.

Ecology: Biotroph; phytopathogenic; growing on stems. Host or Phorophyte Taxonomy: Linaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, not emerging, gregarious, .08-.125 mm in diam.. Margin: External filaments present; 5-9 µm in diameter, hyaline or pigmented (later), growing all across the lower half of the ascocarp, smooth or rough, thin, not ramified, septate (sparsely).

Asci: 1 asci per ascocarp, not stipitate (ascus easily swelling in water), 70-110 µm long, 50-70 µm wide; dehiscence unitunicate (very thin-walled).

Ascospores: c. 8 per ascus, spores 6-8 per ascus, subglobose, ellipsoid (oblong, shape and size of the spores variable, sometimes poorly developed), or ovoid, 15-25 µm long, 9-16 µm wide; septa absent; wall thin, remaining hyaline, hyaline, not ornamented.

Conidiophores: Oidium-type; not branched. Conidium Formation: Conidiogenous cells in chains. Conidia: Macroconidial, not branched, (20)-26-36 µm long, 10-16 µm wide; aseptate; with distintly visible fibrosin body fibrosin bodies.

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