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Erysiphe ellisii (U. Braun) U. Braun & S. Takam.

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-26). Data set reviewer(s): Schubert K. (06-03-23); revised.

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

Type Information: Basionym: Microsphaera ellisii U. Braun. Type: Microsphaera ellisii U. Braun.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells obscure, irregularly polygonal, ca. 10-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [359-360] (1987).

Biogeography: Continent: Northern America (USA, north central states and north eastern states, Tex.; Canada). Country or state(s): Ontario (Canada) and Texas (USA).

Ecology: Biotroph; phytopathogenic; growing on leaves, epiphyllous (usually). Host or Phorophyte Taxonomy: Ostrya virginiana (Mill.) K. Koch; Ostrya, Corylaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, (.065)-.075-.115-(.125) mm in diam.. Margin: External filaments present; recurved (when mature), (1)-2-2.5-(3.5) µm long, 5-7.5 µm in diameter, hyaline or pigmented (brown at the very base), few, 4-15 per mm², growing between the lower and upper hald of the ascocarp, flexuose, smooth or rough, thin or thick (towards the base), ramified, dichotomously branched (3-5 times, branchings regular, close, compact, tips recurved when mature), aseptate or septate (0-3-septate, septa near the base).

Asci: 4-10 asci per ascocarp, not stipitate or indistinctly stipitate, 40-65 µm long, 25-40 µm wide; dehiscence unitunicate.

Ascospores: c. 4 to c. 8 per ascus, spores 5-8 per ascus, subglobose, ellipsoid, or ovoid, 14-20 µm long, 9-13 µm wide; septa absent.

Conidiomata: Present; hyphomycetous.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid or doliiform; macroconidial (length and width measured in dry state !), not branched, 24-30 µm long, 12-14 µm wide; aseptate.

(report generated 04.Okt.2007)

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