Podosphaera verbenae (Savul. & Negru) 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. Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Sphaerotheca verbenae Savul. & Negru.

Taxonomic Literature: Taxonomic notes: +appressoria not lobed, slightly nipple-shaped, sometimes

indistinct;
+conidiophores foot-cells cylindric, often slightly

constricted at the base, followed by 1-3(-4) shorter
cells;
+conidia
germ tubes on side of conidia, simple to forked,
often
short;
+ascoc. outer wall cells conspicuous, large, (10-)15-
55
µm diam., shape irregularly polygonal;
+ascoc. ext. fil.

length variable, 0.25-4 times the cleistothecial diam., often

shorter, sometimes rudimentary;. Braun U., Beih. Nova Hedwigia 89: 1-700 [130-131] (1987); Braun U., The powdery mildews (Erysiphales) of Europe.- 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Nearly cosmopolitan. Continent: Africa, Asia-Temperate, Australasia, Europe, Northern America, and Southern America.

Ecology: Biotroph; phytopathogenic; growing on stems, leaves, and inflorescences, amphigenous. Host or Phorophyte Taxonomy: Verbenaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered and gregarious, .075-.11 mm in diam.. Margin: External filaments present; interlaced with each other, mycelioid, .25-4 µm long, 4-12 µm in diameter, hyaline and pigmented (later, brown thoghout or paler upwards), few and numerous, growing all across the lower half of the ascocarp, smooth and rough, thin, not ramified and ramified, irregularly not branched, septate.

Asci: 1 asci per ascocarp, 60-80 µm long, 50-65 µm wide; dehiscence unitunicate.

Ascospores: c. 8 (development of the ascospores late, asci mostly immature) per ascus, spores 6-8 per ascus, subglobose, broadly ellipsoid, or ovoid, 15-20-(23) µm long, 13-16 µm wide; septa absent; wall thin, remaining hyaline, hyaline, not ornamented.

Conidiomata: Present; hyphomycetous.

Conidiophores: Oidium-type; basal cells 35-100 µm long, 10-13 µm wide. Conidium Formation: Conidiogenous cells long in chains. Conidia: Ellipsoid, cylindrical, or ovoid; macroconidial, not branched, 25-40-(50) µm long, 14.5-21 µm wide; aseptate; with distintly visible fibrosin body fibrosin bodies.

(report generated 04.Okt.2007)