Podosphaera drabae (Juel) U. Braun & S. Takam.

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. Data set revised.

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

Type Information: Basionym: Sphaerotheca drabae Juel.

Taxonomic Literature: Taxonomic notes: +ascocarp outer wall cells conspicuous, irregularly shaped, 10-35(-

50) µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [142] (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 and Far Eastern Asia. Country or state(s): Finland, Iceland, Norway, Germany, Poland, Switzerland (incl. Liechtenstein), France (excl. Corsica), Bulgaria, Greece, Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia), Romania, Belarus, Baltic States (Estonia, Lithuania, Latvia), and Ukraine; Japan; Greenland.

Ecology: Biotroph; phytopathogenic; growing on stems, petioles, or leaves, amphigenous. Host or Phorophyte Taxonomy: Cruciferae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, gregarious (dnesely aggregated, forming dark brown to nearly black patches or coats), (.06)-.07-.09-(.095) mm in diam.. Margin: External filaments present; mycelioid (rather coarse, very short, shorter than the cleistothecial diam., often rudimentary, seldom up to 1.5 times the cleistothecial diam.), up to 1.5 µm long, 4.5-10 µm in diameter, pigmented (brown, sometimes paler upwards), very few (mostly 2-6, often lacking), 2-6 per mm², thin, not ramified, septate.

Asci: 1 asci per ascocarp, sub-globose (mostly), 55-75 µm long, 45-60 µm wide; dehiscence unitunicate.

Ascospores: c. 8 (spres early developed, asci mostly mature) per ascus, spores 6-8 per ascus, subglobose or ellipsoid, 15-30.5 µm long, 10-17.5 µm wide; septa absent; wall thin, remaining hyaline, hyaline, not ornamented.

Conidiomata: Present; hyphomycetous.

Conidiophores: Oidium-type; not branched. Conidium Formation: Conidiogenous cells in chains. Conidia: Macroconidial, not branched, 28-30 µm long, 15-16 µm wide; aseptate; with distintly visible fibrosin body fibrosin bodies.

(report generated 04.Okt.2007)