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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (02-09-25). Data set reviewer(s): Schubert K. (06-01-12); revised.

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

Type Information: Basionym: Erysiphe picridis Castagne. Type: Erysiphe picridis Castagne.

Taxonomic Literature: Taxonomic notes: +primary conidia with maximum width in the upper half of the conidium, l/w ratio about 3,2; conidial surface (SEM) characterized by net-like ridges with 3-4 spines per masch. Braun U., Beih. Nova Hedwigia 89: 1-700 [562-563] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337 [208]. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Asia-Temperate and Europe. Region(s): Siberia (West-). Country or state(s): Germany, Switzerland (incl. Liechtenstein), France (excl. Corsica), and Spain (incl. Andorra & Monaco); West Siberia (Russia).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Picris hieracioides L.; Picris, Compositae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, sub-scattered or gregarious. Margin: External filaments present; mycelioid, straight, numerous, growing all across the lower half of the ascocarp, smooth or rough, thin, septate.

Ascospores: 1–2 per ascus, spores 2 per ascus, ellipsoid or ovoid; septa absent.

Conidiophores: Oidiopsis-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid or cylindrical (primary conidia); macroconidial (dimorphic, primary and secondary conidia), not branched, 50-70 µm long, 14-20 µm wide; aseptate.

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