Erysiphe heraclei DC.

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

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

Type Information: Basionym: Erysiphe heraclei DC.

Taxonomic Literature: Taxonomic notes: +conidiophores foot-cells cylindric, followed by a longer and 1-2 shorter cells, or cells of about the same length, occasionally by shorter cells;+appressoria lobed;+ascocarp outer wall cells irregularly polygonal, obscure, ca. 8-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [215-217] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Africa, Asia-Temperate, Australasia, Europe, Northern America (very rare), Southern America (very rare), and Asia-Tropical. Region(s): Northern Africa, Southern Africa, Far Eastern Asia, China (+ Asia Minor, Central Asia), and New Zealand (introduced). Country or state(s): Finland, United Kingdom, Norway, Sweden, Austria, former Czechoslovakia (incl. Czech Republic & Slovacia), Germany, Hungary, Netherlands, Poland, Switzerland (incl. Liechtenstein), Balearic Islands, 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; Canary Islands (Spain); Japan; India and Pakistan.

Ecology: Biotroph; phytopathogenic; growing on stems, leaves, or inflorescences, amphigenous. Host or Phorophyte Taxonomy: Heracleum sphondylium L.; Heracleum, Umbelliferae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, .08-.12 mm in diam.. Margin: External filaments present; interlaced with each other or interwoven with surrounding mycelium, mycelioid, straight, (.25)-.5-1.5-(2) µm long, (3)-4-8-(10) µm in diameter, pigmented (when mature, yellowishto brown throughout or only in the lower half and paler upwards), few or numerous (number variable, often densely crowded around the ascocarp), growing all across the lower half of the ascocarp, smooth, thin, not ramified or ramified (frequently), not branched (in a coral-like manner), septate (often only few septa).

Asci: (2)-3-6-(8) asci per ascocarp, not stipitate or indistinctly stipitate, 40-75-(85) µm long, 30-45-(50) µm wide; dehiscence unitunicate.

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

Conidiomata: Present; hyphomycetous.

Conidiophores: Pseudoidium-type; not branched; basal cells 20-35-(45) µm long, 8.5-10-(11) µm wide. Conidium Formation: Conidiogenous cells single. Conidia: Ovoid or cylindrical; macroconidial (germ tubes arising from an end, very short to moderartely long, with lobed or club-shaped appressorium), not branched, 25-45-(50) µm long, 12-21 µm wide; aseptate.

(report generated 04.Okt.2007)