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Erysiphe pulchra (Cooke & Peck) U. Braun & S. Takam.

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-27). Data set reviewer(s): Schubert K. (06-01-26); revised.

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

Type Information: Basionym: Microsphaera pulchra Cooke & Peck. Type: Microsphaera pulchra Cooke & Peck.

Taxonomic Literature: Taxonomic notes: + conidiophores 3-celled;+ascomata outer wall cells irregularly polygonal, ca. 10-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [428-429] (1987).

Biogeography: Continent: Asia-Temperate and Northern America (USA: Mass. to N.C., Ill., Wisc.; Canada). Country or state(s): Japan; Idaho (USA), Illinois (USA), Wisconsin (USA), Connecticut (USA), Massachusetts (USA), Georgia (USA), and North Carolina (USA). Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on leaves. Host or Phorophyte Taxonomy: Cornus alternifolia L.; Cornus, Cornaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, .08-.13 mm in diam.. Margin: External filaments present; setiform, recurved (tips of the ultimate branchlets distinctly recurved), 1-2 µm long, 7-10 µm in diameter, hyaline or pigmented (brown at the base), numerous, (4)-8-22 per mm², growing between the lower and upper hald of the ascocarp, stiff and straight (mostly, straight to curved), smooth or rough, thin (above, thick-walled towards the base, sometimes thick-walled throughout) or thick, ramified, dichotomously branched (3-6 times, closely and regularly, occasionally forked in the lower half, tips distinctly recurved), aseptate or septate (0-1-septate).

Asci: 3-8 asci per ascocarp, not stipitate (rarely) or distinctly stipitate, 40-75 µm long, 30-55 µm wide; dehiscence unitunicate.

Ascospores: c. 4 to c. 8 per ascus, spores 4-8 per ascus, ellipsoid or ovoid, 14-28 µm long, 10-15 µm wide; septa absent.

Conidiomata: Present; hyphomycetous.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: More or less ellipsoid; macroconidial, not branched, 23-34 µm long, 10-15 µm wide; aseptate.

(report generated 04.Okt.2007)

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