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Erysiphe paeoniae R. Y. Zheng & G. Q. Chen

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 paeoniae R. Y. Zheng & G. Q. Chen. Type: Erysiphe paeoniae R. Y. Zheng & G. Q. Chen.

Taxonomic Literature: Taxonomic notes: +ascocarp outer wall cells obscure, irregularly polygonal to rounded, ca. 8-20(-25) µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [225] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Asia-Temperate, Australasia, Europe, and Northern America (USA, Tex.). Region(s): Siberia, Far Eastern Asia, China, and Australia (introduced). Country or state(s): Sweden, Austria, former Czechoslovakia (incl. Czech Republic & Slovacia), Germany, Hungary, Poland, Switzerland (incl. Liechtenstein), France (excl. Corsica), Bulgaria, Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia), Romania, Former Yugoslavia [incl. Bosnia and Herzegovina, Croatia, Macedonia, Moldova, Serbia and Montenegro, Slovenia], Belarus, Baltic States (Estonia, Lithuania, Latvia), and Ukraine; Japan; Texas (USA).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Paeonia obovata Maxim.; Paeonia, Paeoniaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, not emerging (epiphyllous ascocarps, mostly, in the dense mycelium; 3: hypophyllous ascocarps), soon sessile, scattered (mostly), (.07)-.09-.12-(.135) mm in diam.. Margin: External filaments present (number variable, often poorly developed, few, very short, or appendages well developed, numerous, often densely crowded around the fruit body); interlaced with each other or interwoven with surrounding mycelium, straight, .25-1-(1.5) µm long, 3.5-7.5-(9) µm in diameter, hyaline or faintly pigmented, few or numerous, growing all across the lower half of the ascocarp, verrucose (outline extremely irregular), thin, not ramified or ramified (very frequently), not branched, aseptate or septate (few inconspicuous septa).

Asci: (3)-4-6-(8) asci per ascocarp, indistinctly stipitate (mostly), (45)-50-70 µm long, (25)-30-45-(50) µm wide; dehiscence unitunicate.

Ascospores: 1–2, c. 4, or c. 8 per ascus, spores (2)-3-5-(7) per ascus, ellipsoid or ovoid, 18-25 µm long, 10-13.5 µm wide; septa absent.

Conidiomata: Present; hyphomycetous.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid or cylindrical; macroconidial, not branched, 28-50 µm long, 12-20 µm wide; aseptate.

(report generated 04.Okt.2007)

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