Erysiphe trifolii Grev. var. trifolii

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

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: variety. Synonyms: Microsphaera trifolii U. Braun var. trifolii; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera trifolii U. Braun var. trifolii. Type: Microsphaera trifolii U. Braun var. trifolii.

Taxonomic Literature: Taxonomic notes: +conidiophores foot cells cylindric, sometimes curved or flexuous, followed by two shorter cells or cells of about the same length;+appressoria slightly lobed to multilobed;+ascomata outer wall cells irregularly polygonal, ca. 8-30 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [291-294] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Africa, Asia-Temperate, Australasia (introduced), Europe, Northern America (USA, Canada; 7: introduced), Southern America, and Asia-Tropical. Region(s): Northern Africa, Southern Africa (introduced), Siberia, Far Eastern Asia, China (+ Central Asia, Asia Minor), and New Zealand. Country or state(s): Denmark, Finland, United Kingdom, Norway, Sweden, Austria, 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, amphigenous. Host or Phorophyte Taxonomy: Trifolium medium L.; Trifolium, Leguminosae-Papilionoideae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid (dorsiventral), orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, (.08)-.09-.15-(.18) mm in diam.. Margin: External filaments present ((5-)10-25(-40) µm long, horizontally spread or sometimes with a tendency to turn towards one direction); interlaced with each other (sometimes), mycelioid or setiform, straight, 2-6 µm long, 5-12.5 µm in diameter, hyaline or more or less pigmented (yellowish to brown in the lower part, paler to hyaline upwards), numerous, 2-12 per mm², growing more or less between the lower and upper hald of the ascocarp, flexuose or geniculate (bent), smooth or rough, thin or moderatly thick (towards the base, rarely thin-walled throughout or moderately thick-walled throughout), not ramified or ramified, dichotomously branched (a varying percentage of the appendages, 1-2 times, very rarely 3 times, branchings loose, widely forked, tips straight, sometimes forked near the base or in the lower half), septate (usually, few septa (ca. 1-6), from the middle downward, sometimes reaching the upper half).

Asci: 3-12 asci per ascocarp, not stipitate or indistinctly stipitate, 45-80 µm long, 25-50 µm wide; dehiscence unitunicate.

Ascospores: 1–2, c. 4, or c. 8 per ascus, spores (2)-3-5-(6) per ascus, ellipsoid or ovoid, 18-30 µm long, 10-16 µm wide; septa absent.

Conidiomata: Present; hyphomycetous.

Conidiophores: Pseudoidium-type; not branched; basal cells (15)-25-38-(55) µm long, 6.5-9 µm wide. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid (lenght and width measured in fresh state), doliiform, or cylindrical; macroconidial, not branched, 30-45-(50) µm long, 16-21 µm wide; aseptate.

(report generated 04.Okt.2007)