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Oidium chrysanthemi Rabenh.

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. Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Oidium chrysanthemi Rabenh. Type: Oidium chrysanthemi Rabenh.

Taxonomic Literature: Taxonomic notes: +hyphae flexuous, branching at right angles near a septum, hyphal cells (60-)80-100(-105) x (5-)6.5-7.5(-8) µm; +appressoria unlobed, indistinct, occasionally nearly nipple-shaped, 5-12 µm wide;+conidiophores foot-cells followed by 1-2 shorter cells of about 20-35 µm in length;+haustoria globose, 17.5-22.5 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [604] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Nearly cosmopolitan. Country or state(s): Finland, Benelux (Belgium & Luxembourg), Germany, Hungary, Poland, Switzerland (incl. Liechtenstein), France (excl. Corsica), Portugal, Spain (incl. Andorra & Monaco), Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia), Romania, Belarus, Baltic States (Estonia, Lithuania, Latvia), and Ukraine.

Ecology: Biotroph; phytopathogenic; growing on stems, leaves, and inflorescences. Host or Phorophyte Taxonomy: Chrysanthemum sp.; Chrysanthemum, Compositae.

Reproduction Strategy: Only known as sterile, asexually reproducing form.

Conidiomata: Present; hyphomycetous.

Conidiophores: Not branched ((60-)105-190(-230) x 10-12.5 µm); basal cells 75-130-(140) µm long, 11-12.5-(15) µm wide. Conidium Formation: Conidiogenous cells in chains. Conidia: More or less ellipsoid, doliiform, or cylindrical; macroconidial (germ tubes on a side of the spore or apical, simple, rarely branched, short to long, terminating in an unlobed or slightly lobed appressorium), not branched, rounded at both ends, 35-50-(80) µm long, 16-22.5-(30) µm wide; aseptate; without distinct fibrosin body fibrosin bodies.

(report generated 04.Okt.2007)

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