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Erysiphe begoniicola U. Braun & S. Takam.

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. Data set reviewer(s): Schubert K. (06-01-24); revised.

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

Type Information: Basionym: Microsphaera begoniae Sivan. Type: Microsphaera begoniae Sivan.

Taxonomic Literature: Taxonomic notes: +appressoria multilobed;+conidiophores foot-cells cylindric, moderately long, followed by 1-2 shorter cells, sometimes by cells of about the same length or by a single longer cell;+ascocarp outer wall cells irregularly polygonal, ca. 8-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [321-323] (1987); Braun U. The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Africa, Asia-Temperate, Australasia, Europe, Northern America, and Asia-Tropical. Region(s): Southern Africa and New Zealand (distribution insufficiently known; it is possible that some records of). Country or state(s): Denmark, Finland, Portugal, and Romania.

Ecology: Biotroph; phytopathogenic; growing on stems, leaves, or inflorescences, amphigenous. Host or Phorophyte Taxonomy: Begonia sp.; Begonia, Begoniaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered (rarely) or gregarious, .09-.15 mm in diam.. Margin: External filaments present; setiform, straight (tips of the ultimate branchlets not recurved, rarely few tips slightly recurved), 1-1.5 µm long, 7-14 µm in diameter, hyaline or pigmented (in the lower half, between base and the remotest septum, yellowish to brown), numerous, (6)-10-22-(30) per mm², growing between the lower and upper hald of the ascocarp, stiff and straight (rather), smooth or rough (usually), thin or moderatly thick (below), ramified, dichotomously branched (4-5 times, branchings relatively regular, close or somewhat looser, with elongated primary and secondary branches, tips or the ultimate branchlets not recurved, rarely few tips slightly recurved, occasionally forked in the lower half), very rarely aseptate or septate ((0-)1-3(-4)-septate).

Asci: 6-10 asci per ascocarp, not stipitate or indistinctly stipitate (mostly), 50-80 µm long, 30-50 µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores (3)-5-8 per ascus, subglobose, ellipsoid, or ovoid, 16-24 µm long, 10-16 µm wide; septa absent.

Conidiomata: Present; hyphomycetous.

Conidiophores: Pseudoidium-type; not branched; basal cells 17.5-50-(55) µm long, (6.5)-8-9-(11.5) µm wide. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid, ovoid, or cylindrical (with rounded ends, variable); macroconidial (germ tubes at an end, branched or simple, straight or flexuous, short to moderately long, terminating in a lobed appressorium or apex simple), not branched, (25)-35-60-(70) µm long, (12)-14-22.5-(25) µm wide; aseptate.

(report generated 04.Okt.2007)

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