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Erysiphe thaxteri (Havryl. & U. Braun) U. Braun & S. Takam. [2000141]

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Schubert K. @EXCL@ Kainz C. (06-03-29).

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

Type Information: Basionym: Microsphaera thaxteri Havryl. & U. Braun. Type: Microsphaera thaxteri Havryl. & U. Braun.

Taxonomic Literature: Taxonomic notes: +peridial cells irregularly polygonal to rounded, 10-15 µm diam.; +hyphal appressoria nipple-shaped to lobed; +vegetative hyphae 3-5 µm wide. Havrylenko M. & Braun U., Nova Hedwigia 66: 513-522 (1998).

Biogeography: Continent: Southern America (Argentina, Prov. Rio Negro & Neuquen).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Berberis buxifolia Lam.; Berberis, Berberidaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, in loose groups, .062-.11 mm in diam.. Margin: External filaments present; not interlaced, recurved, hyaline or pigmented (yellowish at the very base), few, growing between the lower and upper hald of the ascocarp, stiff and straight, smooth, thin, ramified, dichotomously branched (5-6 times, branchings close and regular), aseptate or septate (0-1-septate).

Asci: 8 asci per ascocarp, broadly clavate (saccate), not stipitate, 42-61 µm long, 28-45 µm wide; dehiscence unitunicate.

Ascospores: c. 4 per ascus, spores 4-5 per ascus, ellipsoid or ovoid, 16-25 µm long, 8-14 µm wide; septa absent.

Conidiomata: Present; hyphomycetous.

Conidiophores: Pseudoidium-type (erect, foot-cells cylindrical, slightly curved, followed by one or two shorter cells); not branched; basal cells 20-48 µm long, 6-11 µm wide. Conidium Formation: Conidiogenous cells single. Conidia: Cylindrical; macroconidial (with one or two subapical germ tubes), not branched, 27-45 µm long, 10-12 µm wide; aseptate.

(report generated 04.Okt.2007)

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