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Erysiphe oehrensii (Havryl.) U. Braun & S. Takam.

Data Set Maintenance: Data set compiled and standard item; reviewer(s): Schubert K. (06-01-30); revised.

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

Type Information: Basionym: Microsphaera oehrensii Havryl. Type: Microsphaera oehrensii Havryl.

Taxonomic Literature: Taxonomic notes: + peridium thin, cells irregularly polygonal, 17-20 µm diam.; vegetative hyphae ca. 3-8 µm wide, septate, branched, hyaline; appressoria lobed, usually multilobed; conidiophores erect, robust, foot-cells straight, cylindrical, followed by 1-2 cells, the subsequent cells are usually about as long as the foot-cells or longer, seldom shorter. Havrylenko M., Mycotaxon 49: 257-267 (1993).

Biogeography: Continent: Southern America (Argentina, Prov. Río Negro).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Maytenus magellanica Hook. f.; Maytenus, Celastraceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered (and scarce), .08-.096 mm in diam.. Margin: External filaments present; mycelioid or setiform, straight, 4 µm long, hyaline or pigmented (yellowish at the base), few, 8-12 per mm², growing between the lower and upper hald of the ascocarp, flexuose (undulate) or geniculate (bent), rough, not ramified or ramified, dichotomously branched (one time, branching loose), septate.

Asci: 4-5 asci per ascocarp, not stipitate or indistinctly stipitate, 50-60 µm long, 30-44 µm wide; dehiscence unitunicate.

Ascospores: c. 4 to c. 8 per ascus, spores 3-5 per ascus, ellipsoid, (20)-22-24 µm long, 10-12 µm wide; septa absent.

Conidiomata: Present (Oidium robustum U. Braun & Oehrens); hyphomycetous.

Conidiophores: Pseudoidium-type; not branched; basal cells 20-30 µm long, 8-13 µm wide. Conidium Formation: Conidiogenous cells single. Conidia: More or less cylindrical (mostly long and slender); macroconidial, not branched, 28-50 µm long, 13-18 µm wide; aseptate.

(report generated 04.Okt.2007)

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