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Erysiphe palczewskii (Jacz.) U. Braun & S. Takam.

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. Data set reviewer(s): Schubert K. (06-01-25); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Microsphaera subtrichotoma U. Braun; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera palczewskii Jacz. Type: Microsphaera palczewskii Jacz.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells irregularly polygonal to rounded, obscure, ca. 8-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [339-340] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Asia-Temperate (Central Asia) and Europe (introduced). Region(s): Siberia, Far Eastern Asia, and China (+ Central Asia). Country or state(s): Sweden, Germany, Poland, Romania, Belarus, Baltic States (Estonia, Lithuania, Latvia), and Ukraine; Kazakhstan.

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Caragana arborescens Lam.; Caragana, Leguminosae-Papilionoideae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, more or less gregarious, .08-.14 mm in diam.. Margin: External filaments present; mycelioid or setiform (intermediary, rather setiform), straight (tips of the ultimate branchlets not recurved), 1-2 µm long, 7-11 µm in diameter, hyaline or somewhat pigmented (occasionally at the base), few or numerous, 5-20 per mm², growing more or less between the lower and upper hald of the ascocarp or on the upper half of the ascocarp (somewhat), stiff and straight (rather), smooth or rough (below), thin or thick (towards the base), ramified, dichotomously branched ((4-)5-8 times, branchings compact, close, branches of all orders short, rarely branchings looser, tips of the ultimate branchlets straight, not recurved), aseptate or septate (0-1-septate).

Asci: 4-13 asci per ascocarp, indistinctly stipitate (usually), 45-80 µm long, 25-40 µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores (3)-4-7-(8) per ascus, subglobose, ellipsoid, or ovoid, 14-27 µm long, 8-15 µm wide; septa absent.

Conidiomata: Present; hyphomycetous.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid or cylindrical; macroconidial, not branched, 21-37 µm long, 11-19 µm wide; aseptate.

(report generated 04.Okt.2007)

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