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Erysiphe knautiae Duby

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. Data set reviewer(s): Schubert K. (06-03-24); revised.

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

Type Information: Basionym: Erysiphe knautiae Duby. Type: Erysiphe knautiae Duby.

Taxonomic Literature: Taxonomic notes: +conidiophores foot-cells cylindric, followed by 1-3 shorter cells, the second cells sometimes as long as the foot-cells, rarely exceeding;+appressoria lobed;+ascocarp outer wall cells polygonal, 8-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [206] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Asia-Temperate, Europe, and Northern America (USA, very rare). Region(s): Siberia, Far Eastern Asia, Middle Asia, and China. Country or state(s): Denmark, Finland, United Kingdom, Norway, Sweden, Austria, Benelux (Belgium & Luxembourg), former Czechoslovakia (incl. Czech Republic & Slovacia), Germany, Hungary, Poland, Switzerland (incl. Liechtenstein), France (excl. Corsica), Spain (incl. Andorra & Monaco), Bulgaria, Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia), Romania, European Turkey, Former Yugoslavia [incl. Bosnia and Herzegovina, Croatia, Macedonia, Moldova, Serbia and Montenegro, Slovenia], Belarus, Baltic States (Estonia, Lithuania, Latvia), and Ukraine; Japan.

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous (irregular patches or often covering the entire surface of the leaves). Host or Phorophyte Taxonomy: Knautia arvensis (L.) Coult.; Knautia, Dipsacaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, (.07)-.075-.105-(.125) mm in diam.. Margin: External filaments present (rather coarse); mycelioid, straight, (.5)-1-4 µm long, 5-10 µm in diameter, pigmented (brown from base to top when mature or brown below and paler above), few (usually), 5-15 per mm², growing all across the lower half of the ascocarp, thin, not ramified, septate.

Asci: (2)-3-6-(8) asci per ascocarp, not stipitate or indistinctly stipitate, 40-70 µm long, 30-50 µm wide; dehiscence unitunicate.

Ascospores: 1–2 to c. 4 per ascus, spores (2)-3-5 per ascus, ellipsoid or ovoid, (18)-20-30.5 µm long, (8.5)-11-17 µm wide; septa absent.

Conidiomata: Present; hyphomycetous.

Conidiophores: Pseudoidium-type; not branched; basal cells (25)-30-45-(65) µm long, 7-10-(12) µm wide. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid, ovoid, or sub-cylindrical; macroconidial, not branched, 23-46 µm long, (13)-15-20-(25) µm wide; aseptate.

(report generated 04.Okt.2007)

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