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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. Data set reviewer(s): Schubert K. (06-03-29); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Erysiphe cichoracearum f. verbenae Jacz.; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Erysiphe verbenae Schwein. Type: Erysiphe verbenae Schwein.

Taxonomic Literature: Taxonomic notes: +conidiophores foot-cells straight, increasing in width from base to top, somewhat constricted at the basal septum;+ascocarp outer wall cells obscure, irregularly shaped, ca. 10-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [245-246] (1987).

Biogeography: Continent: Northern America (USA, Canada). Country or state(s): Ontario (Canada), Montana (USA), Illinois (USA), Iowa (USA), Kansas (USA), Minnesota (USA), Missouri (USA), Nebraska (USA), Oklahoma (USA), South Dakota (USA), Wisconsin (USA), Connecticut (USA), Indiana (USA), New Jersey (USA), New York (USA), Ohio (USA), Pennsylvania (USA), Vermont (USA), New Mexico (USA), Alabama (USA), Delaware (USA), Kentucky (USA), Mississippi (USA), North Carolina (USA), and District of Columbia (USA). Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Verbena urticifolia L.; Verbena, Verbenaceae.

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 mycelial layer), scattered or gregarious, .08-.14 mm in diam.. Margin: External filaments present; interlaced with each other or interwoven with surrounding mycelium, mycelioid (mostly rather coarse), straight, .5-2 µm long, 4-10.5 µm in diameter, pigmented (brown when mature), numerous, growing all across the lower half of the ascocarp, smooth or rough, thin, not ramified, septate.

Asci: 5-15 asci per ascocarp, distinctly stipitate, 50-80 µm long, 25-45 µm wide; dehiscence unitunicate (asci usually filled with numerous oil-drops).

Ascospores: 1–2 per ascus, spores 2 per ascus, ellipsoid or ovoid, 19-26 µm long, 12-16 µm wide; septa absent.

Conidiophores: Euoidium-type; not branched; basal cells 8-12-(16) µm wide. Conidium Formation: Conidiogenous cells in chains. Conidia: Ellipsoid, ovoid, or doliiform; macroconidial, not branched, 26-35 µm long, 12-18 µm wide; aseptate.

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