Erysiphe alphitoides (Griffon & Maubl.) U. Braun & S. Takam. var. alphitoides

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-26). Data set reviewer(s): Schubert K. (06-01-24); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: variety. Synonyms: Microsphaera alphitoides var. alphitoides Griff. & Maubl.; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera alphitoides var. alphitoides Griff. & Maubl. Type: Microsphaera alphitoides var. alphitoides Griff. & Maubl.

Taxonomic Literature: Taxonomic notes: +conidiophores foot-cells cylindric, straight, occsionally foot-cells curved, followed by 1-3 shorter cells, sometimes followed by cells of about the same length;+appressoria lobed;+ascomata outer wall cells irregularly polygonal, ca. 8-25(-30) µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [386-388] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Nearly cosmopolitan. Continent: Africa, Asia-Temperate, Australasia, Europe, Northern America, Southern America, Pacific, and Asia-Tropical. Country or state(s): Denmark, United Kingdom, Norway, Sweden, Austria, Benelux (Belgium & Luxembourg), former Czechoslovakia (incl. Czech Republic & Slovacia), Germany, Hungary, Netherlands, Poland, Switzerland (incl. Liechtenstein), France (excl. Corsica), Portugal, Spain (incl. Andorra & Monaco), Bulgaria, Greece, Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia), Romania, European Turkey, Former Yugoslavia [incl. Bosnia and Herzegovina, Croatia, Macedonia, Moldova, Serbia and Montenegro, Slovenia], Belarus, Baltic States (Estonia, Lithuania, Latvia), and Ukraine.

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous, causing the growth of galls (leaves sometimes difigured and distortet). Host or Phorophyte Taxonomy: Quercus robur; Quercus, Anacardiaceae (occasionally, + occasionally on Hippocastanaceae (224), mostly only the anamorphic state), Fagaceae, and Hippocastanaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered and gregarious, .07-.18 mm in diam.. Margin: External filaments present; setiform, recurved (tips of the ultimate branchlets recurved when mature), (.5)-.75-1.5-(2) µm long, 6-12.5 µm in diameter, hyaline and pigmented (at the base), few, (4)-8-18-(28) per mm², growing between the lower and upper hald of the ascocarp, stiff and straight (straight to curved), smooth and rough, thin (above, thick-walled towards the base) and thick, ramified, dichotomously branched (4-6(-7) times, branchings close and regular, tips of the ultimate branchlets recurved when mature, occasionally branchings looser, primary branches elongated, rarely deeply celft, forked in the lower half), aseptate and septate (0-1(-2)-septate).

Asci: 5-16 asci per ascocarp, not stipitate and indistinctly stipitate, 45-80 µm long, 30-55 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores (4)-6-8 per ascus, subglobose, ellipsoid, and ovoid, (14)-16-26 µm long, 9-15 µm wide; septa absent.

Conidiomata: Present; hyphomycetous.

Conidiophores: Pseudoidium-type; not branched; basal cells 15-30 µm long, 6-9-(10) µm wide. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid, ovoid, and doliiform or sub-cylindrical (rarely); macroconidial (germ tubes at an end of the spores, short to moderately long, terminating in a lobed appressorium), 25-40 µm long, 13-23 µm wide.

(report generated 04.Okt.2007)