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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-08-01). Data set reviewer(s): Schubert K. (06-07-24); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Acrosporium cyparissiae (Syd.) Subram.; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Oidium cyparissiae Syd. Type: Oidium cyparissiae Syd.

Taxonomic Literature: Taxonomic notes: This Oidium differs from the anamorph of Sphaerotheca euphorbiae by larger conidia, secondary mycelium not developed. Braun U., Beih. Nova Hedwigia 89: 1-700 [606] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Northern hemispheric. Continent: Europe. Country or state(s): Finland, Sweden, Germany, Poland, Switzerland (incl. Liechtenstein), France (excl. Corsica), Belarus, Baltic States (Estonia, Lithuania, Latvia), and Ukraine.

Ecology: Biotroph; phytopathogenic. Host or Phorophyte Taxonomy: Euphorbia cyparissias L.; Euphorbia, Euphorbiaceae.

Conidiophores: Euoidium-type; not branched. Conidium Formation: Conidiogenous cells in chains. Conidia: Ellipsoid or cylindrical; macroconidial, not branched, 35-45 µm long, 10-15 µm wide; aseptate.

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