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Golovinomyces orontii (Castagne) V. P. Gelyuta

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. Data set reviewer(s): Schubert K. (06-03-29); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Erysiphe orontii Castagne; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Erysiphe orontii Castagne. Type: Erysiphe orontii Castagne.

Taxonomic Literature: Taxonomic notes: Cleistothecia largely agreeing with those of E. cichoracearum.+appressoria nipple-shaped, often poorly developed;+conidiophores erect, simple, foot-cells straight or often curved in the basal half, followed by 1-3 shorter cells (ca. 10-25 x 11-14 µm), sometimes cells longer;+ascocarp outer wall cells irregularly shaped, ca. 8-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [252-253] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Cosmopolitan. 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.

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Antirrhinum orontium L.; Antirrhinum, Acanthaceae, Apocynaceae, Asclepiadaceae, Begoniaceae, Bignoniaceae, Campanulaceae, Cistaceae, Compositae, Crassulaceae, Cruciferae, Cucurbitaceae, Ericaceae, Euphorbiaceae, Gesneriaceae, Hydrangeaceae, Labiatae, Linaceae, Malvaceae, Myrtaceae, Oxalidaceae, Papaveraceae, Pedaliaceae, Primulaceae, Scrophulariaceae, Solanaceae, Urticaceae, Valerianaceae, Verbenaceae, Violaceae, and Vitaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, .08-.14 mm in diam.. Margin: External filaments present (width irregular); interlaced with each other or interwoven with surrounding mycelium, mycelioid, straight, .5-2 µm long, (3)-5-7.5-(10) µm in diameter, pigmented (brown, paler upwards), numerous, growing all across the lower half of the ascocarp, smooth or rough, thin, not ramified (generally; 2: rarely) or ramified, irregular, septate.

Asci: 5-14 asci per ascocarp, distinctly stipitate, 45-75 µm long, 25-40 µm wide; dehiscence unitunicate.

Ascospores: 1–2 to c. 4 per ascus, spores 2-(4) per ascus, ellipsoid or ovoid, 16-25 µm long, 12-15-(17) µm wide; septa absent; wall hyaline or pale brown (yellowish).

Conidiomata: Present; hyphomycetous.

Conidiophores: Euoidium-type; not branched; basal cells 40-100 µm long, 10-13 µm wide. Conidium Formation: Conidiogenous cells in chains (chains usually not very long, spore units unswollen). Conidia: Ellipsoid, ovoid, doliiform, or sub-cylindrical; macroconidial (length and width measured on fresh material, l/w ratio usually somewhat below 2, germ tubes arising from an end, occasionally from a side, usually fairly short, about as long as the conidium or shorter, frequently somewhat twisted, broadened, sometimes straight, bent or helicoid, rarely forked, apically often somewhat swollen), not branched, 25-40 µm long, 15-23 µm wide; aseptate.

(report generated 04.Okt.2007)

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