Erysiphe betae (Vanha) Weltzien

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

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

Type Information: Basionym: Microsphaera betae Vanha.

Taxonomic Literature: Taxonomic notes: +conidiophores foot-cellc cylindric, followed by a longer and 1(-2)

shorter cells (dominant arrangement), occasionally foot-cells

followed by cells of approximately the same length;
+appressoria

lobed;
+ascocarp outer wall cells polygonal or irregularly shaped,

ca. 10-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [217-218] (1987);; Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Africa, Asia-Temperate, Europe, Northern America, Southern America, and Asia-Tropical. Region(s): Siberia, Middle Asia, and China. Country or state(s): United Kingdom, Germany, Corsica (France), France (excl. Corsica), Portugal, Spain (incl. Andorra & Monaco), Romania, Crimea (Ukraine), and Ukraine; Japan and Taiwan; India and Pakistan.

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Chenopodiaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, gregarious or in loose groups, (.075)-.1-.12-(.135) mm in diam.. Margin: External filaments present (mostly about as long as the diam., often very short); mycelioid, .5-1.5-(2.5) µm long, 4-9 µm in diameter, pigmented (brown below, paler in the upper half), numerous, growing all across the lower half of the ascocarp, thin, not ramified or ramified (frequently), not branched, septate.

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

Ascospores: 1–2 or c. 4 per ascus, spores 3-5 per ascus, ellipsoid or ovoid, 18-26 µm long, 11-16 µm wide; septa absent; wall thin, remaining hyaline, hyaline, not ornamented.

Conidiomata: Present; hyphomycetous.

Conidiophores: Branched; basal cells 18-35-(40) µm long, 7-11 µm wide. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid, more or less cylindrical, or ovoid; macroconidial (germ tubes on an end, usually short and stout, apex somewhat swollen or lobed), not branched, 30-50 µm long, (11)-14-22.5 µm wide; aseptate; without distinct fibrosin body fibrosin bodies.

(report generated 04.Okt.2007)