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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. (06-01-26); revised.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Synonyms: Erysiphe valerianae (Jacz.) S. Blumer; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Erysiphe cichoracearum f. valerianae Jacz. Type: Erysiphe cichoracearum f. valerianae Jacz.

Taxonomic Literature: Taxonomic notes: Persistent hyphae turning brown with age, groups of ascocarps, appendages and coloured hyphae often forming dark patches or covers.+appressoria nipple-shaped;+ascocarp outer wall cells irregularly shaped, ca. 8-30 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [262] (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). Region(s): Siberia, Middle Asia, Western Asia, and China. Country or state(s): Denmark, Finland, United Kingdom, Sweden, Austria, former Czechoslovakia (incl. Czech Republic & Slovacia), Germany, Netherlands, Poland, Switzerland (incl. Liechtenstein), France (excl. Corsica), Portugal, Spain (incl. Andorra & Monaco), Bulgaria, Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia), Romania, European Turkey, Belarus, Baltic States (Estonia, Lithuania, Latvia), and Ukraine; Israel & Palestine; Colarado (USA), Wyoming (USA), Wisconsin (USA), and Utah (USA). Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on stems or leaves, amphigenous. Host or Phorophyte Taxonomy: Valeriana officinalis L.; Valeriana, Valerianaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, not emerging (in the dense mycelial layer), scattered or gregarious, (.07)-.08-.14-(.15) mm in diam.. Margin: External filaments present; interlaced with each other or interwoven with surrounding mycelium, mycelioid, straight, .5-2 µm long, 5-13 µm in diameter, pigmented (brown when mature), numerous, growing all across the lower half of the ascocarp, smooth, thin, not ramified, septate.

Asci: (4)-6-15-(20) asci per ascocarp, not stipitate (rarely) or distinctly stipitate, 40-80 µm long, 25-45 µm wide; dehiscence unitunicate (often filled with numerous larger oil-drops).

Ascospores: 1–2 per ascus, spores 2 per ascus, ellipsoid or ovoid, 18-25-(30) µm long, 11-18 µm wide; septa absent.

Conidiophores: Euoidium-type; not branched. Conidium Formation: Conidiogenous cells in chains. Conidia: Ellipsoid, ovoid, or doliiform; macroconidial, not branched, 25-38 µm long, 13-20 µm wide; aseptate.

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