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Erysiphe myzodendri (Speer & Oehrens) U. Braun & S. Takam.

Data Set Maintenance: Data set compiled and standard item; reviewer(s): Schubert K. (06-03-24); revised.

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

Type Information: Basionym: Microsphaera myzodendri Speer & Oehrens. Type: Microsphaera myzodendri Speer & Oehrens.

Taxonomic Literature: Taxonomic notes: +appressoria lobed;+conidiophores foot-cells cylindric, stout, followed by 1-3 shorter cells or a single cell of about the same length;+ascocarp outer wall cells irregularly polygonal, obscure, ca. 8-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [307-308] (1987).

Biogeography: Continent: Southern America (Chile, endemic).

Ecology: Biotroph; phytopathogenic; growing on inflorescences. Host or Phorophyte Taxonomy: Myzodendron imbricatum Poepp. & Endl.; Myzodendron, Misodendraceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, in loose groups or gregarious, .115-.195 mm in diam.. Margin: External filaments present; sometimes recurved or straight, (3)-4-8-(10) µm long, 4-11 µm in diameter, hyaline or pigmented (only at the base), numerous, (6)-8-20-(25) per mm², growing between the lower and upper hald of the ascocarp, flexuose (up to 1200 µm long, sometimes with a tendency to turn towards one direction), smooth or rough, thin, moderatly thick, or thick (towards the base), not ramified or ramified, dichotomously branched (0-6 times, branchings loose and diffuse, primary and secondary branches often elongated, occasionally somewhat recurved, tips of the ultimate branches mostly straight, sometimes recurved), aseptate or septate (1 septum).

Asci: (8)-10-20-(25) asci per ascocarp, distinctly stipitate, 50-85 µm long, 25-40 µm wide; dehiscence unitunicate.

Ascospores: c. 8 (size and shape variable) per ascus, spores (6)-8 per ascus, subglobose, ellipsoid (mostly ellipsoid-ovoid), ovoid, or sub-cylindrical, 14-28 µm long, 8-12.5 µm wide; septa absent; wall hyaline or pale brown (yellowish).

Conidiomata: Present; hyphomycetous.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid, ovoid, or more or less cylindrical; macroconidial, not branched, 26-42 µm long, 11-15.5 µm wide; aseptate.

(report generated 04.Okt.2007)

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