Erysiphe hypophylla (Nevod.) U. Braun & S. Takam.

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-26). Data set reviewer(s): Schubert K. (06-01-25); revised.

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

Type Information: Basionym: Microsphaera hypophylla Nevod. Type: Microsphaera hypophylla Nevod.

Taxonomic Literature: Taxonomic notes: +appressoria multilobed, 5-7.5 µm wide, frequently opposite in pairs;+conidiophores foot-cells flexuous, followed by 1-2 cells or about 10-35 x 8.7-10 µm;+ascomata outer wall cells irregularly polygonal, ca. 8-25(-30) µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [388-389] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Asia-Temperate (Central Asia to China), Australasia, and Europe (nearly all). Region(s): China and New Zealand (introduced). Country or state(s): Denmark, Finland, 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; Japan.

Ecology: Biotroph; phytopathogenic; growing on leaves, hypophyllous (mostly) or amphigenous, causing no organ deformation. Host or Phorophyte Taxonomy: Quercus robur L.; Quercus, Fagaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, (.07)-.08-.14-(.155) mm in diam.. Margin: External filaments present; setiform, recurved (tips of the ultimate branchlets distinctly recurved when mature), (.75)-1-1.5-(2) µm long, 7-11 µm in diameter, hyaline or pigmented (occasionally at the base), few or numerous, (5)-10-20-(25) per mm², growing between the lower and upper hald of the ascocarp, stiff and straight, smooth or rough, thin or thick (towards the base), ramified, dichotomously branched ((4-)5-6(-8) times, branchings close and regular, occasionally loosely branched, tips distinctly recurved whe mature, appendages very rarely forked in the lower half), aseptate or septate (0-1-sepate).

Asci: 4-10 asci per ascocarp, not stipitate or indistinctly stipitate (mostly, occasionally absent (1)), (40)-50-70-(80) µm long, (25)-30-50-(55) µm wide; dehiscence unitunicate.

Ascospores: c. 4 to c. 8 per ascus, spores (4)-6-8 per ascus, ellipsoid or ovoid, (14)-16-25-(30) µm long, (6)-9-14.5-(15) µm wide; septa absent.

Conidiomata: Present; hyphomycetous.

Conidiophores: Pseudoidium-type; not branched; basal cells 20-28 µm long, 7.5 µm wide. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid or cylindrical (with rounded ends); macroconidial (germ tubes at an end, simple, short, ca. 3-5 µm wide, apex simple or with lobed appressorium), not branched, rounded at both ends, 30-45-(65) µm long, 12-17.5-(18.5) µm wide; aseptate.

(report generated 04.Okt.2007)