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Erysiphe platani (Howe) U. Braun & S. Takam.

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-27). Data set reviewer(s): Schubert K. (06-03-27); revised.

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

Type Information: Basionym: Microsphaera platani Howe. Type: Microsphaera platani Howe.

Taxonomic Literature: Taxonomic notes: +appressoria lobed, one per cell or 2-6 grouped together;+conidiophores foot-cells straight or often somewhat curved or flexuous, followed by 1-3 mostly shorter cells, width of the conidiophores somewhat increasing upwards;+ascomata outer wall cells irregularly polygonal, ca. 8-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [430-431] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995); Pastircakova, K. & Pastircak, M., Mycotaxon 97: 189-194 (2006).

Biogeography: Continent: Africa, Asia-Temperate, Australasia, Europe (introduced), Northern America (USA, Canada, generally distributed, wherever plane trees are planted and throughout the entire range of the hosts; introduced in Australia), and Southern America (Argentina, Chile). Region(s): Southern Africa (introduced), Australia, and New Zealand. Country or state(s): former Czechoslovakia (incl. Czech Republic & Slovacia), France (excl. Corsica), Portugal, Spain (incl. Andorra & Monaco), Bulgaria, Greece, Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia), Romania, Former Yugoslavia [incl. Bosnia and Herzegovina, Croatia, Macedonia, Moldova, Serbia and Montenegro, Slovenia], and North-western Russia; Israel & Palestine; Oklahoma (USA), New Jersey (USA), New York (USA), California (USA), Florida (USA), Georgia (USA), Mississippi (USA), and North Carolina (USA). Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on leaves, petioles, or inflorescences, amphigenous, causing the growth of galls (leaves often disfigured, distorted). Host or Phorophyte Taxonomy: Platanus occidentalis L.; Platanus, Platanaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, .08-.115 mm in diam.. Margin: External filaments present (straight to curved); recurved, 1-2 µm long, 6-10 µm in diameter, hyaline or pigmented (brown at the base), few or numerous, 6-18 per mm², growing between the lower and upper hald of the ascocarp, stiff and straight (to curved), smooth or rough, thin or thick (towards the base), ramified, dichotomously branched (4-5(-6) times, closely and regularly, branchings rarely trichotomous, occasionally forked in the lower half, tips recurved) or trichotomously branched, aseptate or septate (0-1-septate).

Asci: 3-6 asci per ascocarp, indistinctly stipitate, 40-60 µm long, 30-50 µm wide; dehiscence unitunicate.

Ascospores: c. 4 per ascus, spores 3-5 per ascus, ellipsoid or ovoid, 18-25 µm long, 12-16 µm wide; septa absent.

Conidiomata: Present; hyphomycetous.

Conidiophores: Pseudoidium-type; not branched (erect, 1-3-septate, hyaline); conidiophore cells 90-220 µm long, basal cells 40-80-(90) µm long, 5-10 µm wide. Conidium Formation: Conidiogenous cells single or in chains (secondary conidia single, sporadically adhering in chains of 2 to 3). Conidia: Ellipsoid (sometimes oblong), ovoid, or doliiform; macroconidial (primary conidia with rounded apex and subtruncate base, 28.5-43 14-20 µm; secondary conidia with slightly convex symmetric ends; germ tubes at an end of the spore, terminating in a lobed appressorium), not branched, 25-50 µm long, 14-22.5 µm wide; aseptate; cell wall hyaline; without distinct fibrosin body fibrosin bodies.

(report generated 04.Okt.2007)

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