Golovinomyces artemisiae (Grev.) V. P. Gelyuta

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

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

Type Information: Basionym: Erysiphe artemisiae Grev. Type: Erysiphe artemisiae Grev.

Taxonomic Literature: Taxonomic notes: +conidiophores erect, straight, foot-cells cylindric, followed by 1-3 shorter cells, often somewhat attenuated at the basal septum of the foot-cell (0.5-1.5 µm);+appressoria nipple-shaped;+ascocarp outer wall cells irregularly shaped, 6-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [254-255] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Asia-Temperate, Europe, and Northern America (USA, Canada, Alaska). Region(s): Siberia, Far Eastern Asia, Middle Asia, and China. Country or state(s): Denmark, Finland, United Kingdom, Sweden, former Czechoslovakia (incl. Czech Republic & Slovacia), Germany, Hungary, Poland, Switzerland (incl. Liechtenstein), France (excl. Corsica), Spain (incl. Andorra & Monaco), Bulgaria, Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia), Romania, Former Yugoslavia [incl. Bosnia and Herzegovina, Croatia, Macedonia, Moldova, Serbia and Montenegro, Slovenia], Belarus, Baltic States (Estonia, Lithuania, Latvia), and Ukraine; Japan; Alaska (USA).

Ecology: Biotroph; phytopathogenic; growing on leaves, hypophyllous (sometimes only) or amphigenous (epiphyllous mycelium usually persistent, hypophyllous mycelium evanescent or less conspicuous because of the dense tomentum of the leaves). Host or Phorophyte Taxonomy: Artemisia vulgaris L.; Artemisia, Compositae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, not emerging (often, in the dense tomentum of the host leaves), scattered or gregarious, (.09)-.1-.15-(.17) mm in diam.. Margin: External filaments present (mostly short, shorter than the cleistothecial diam., sometimes very short, rudimentary, on glabrous leaves appendages often longer); interlaced with each other or interwoven with surrounding mycelium, mycelioid, straight, .25-1-(2) µm long, 3-8 µm in diameter, hyaline or faintly pigmented (yellowish to pale brown), few or numerous, growing all across the lower half of the ascocarp, smooth or rough, thin, not ramified, septate.

Asci: (5)-8-20-(25) asci per ascocarp, not stipitate (rarely) or distinctly stipitate, 50-90 µm long, 25-45-(50) µm wide; dehiscence unitunicate.

Ascospores: 1–2 or c. 4 per ascus, spores 2-(3) per ascus, ellipsoid or ovoid (oblong), 18-30 µm long, 11-20 µm wide; septa absent.

Conidiomata: Present; hyphomycetous.

Conidiophores: Euoidium-type; not branched; basal cells 45-100 µm long, 10-15 µm wide. Conidium Formation: Conidiogenous cells in chains. Conidia: Ellipsoid, ovoid, doliiform, or sub-cylindrical; macroconidial, not branched, (20)-24-35-(38) µm long, (14)-16-26 µm wide; aseptate.

(report generated 04.Okt.2007)