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Erysiphe extensa (Cooke & Peck) U. Braun & S. Takam. var. extensa

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-26). Data set revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: variety. Synonyms: Microsphaera extensa var. extensa Cooke & Peck; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Type: Microsphaera extensa var. extensa Cooke & Peck.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells obscure, irregularly polygonal, ca. 7.5-20
µm diam.;.
Braun U., Beih. Nova Hedwigia 89: 1-700 [358-359] (1987).

Biogeography: Continent: Northern America (USA, Canada, generally distributed).

Ecology: Biotroph; phytopathogenic; growing on leaves, epiphyllous (mostly) or amphigenous. Host or Phorophyte Taxonomy: Fagaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, (80)-90-170 mm in diam.. Margin: External filaments present; 2-6 µm long, 5-10 µm in diameter, hyaline or faintly pigmented (sometimes near the base), 5-22 per mm², growing between the lower and upper hald of the ascocarp, flexuose, smooth or rough (often), thin or moderatly thick (towards the base), ramified, dichotomously branched (3-6 times, closely and regularly, sometimes primary branches elongated and branches looser, tips of the ultimate branchlets recurved, appendages sometimes forked in the lower half), aseptate or septate (with a single septum at the base).

Asci: 4-10 asci per ascocarp, sub-globose (often), not stipitate or indistinctly stipitate, 45-65 µm long, 35-50 µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores 4-6 per ascus, subglobose, ellipsoid, or ovoid, 18-25 µm long, 12-17 µm wide; septa absent.

Conidiomata: Present; hyphomycetous.

Conidiophores: Not branched. Conidium Formation: Conidiogenous cells single. Conidia: Cylindrical; macroconidial.

(report generated 04.Okt.2007)

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