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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-21). Data set reviewer(s): Schubert K. (06-03-28); not revised (00-08-28).

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: variety. Synonyms: Erysiphe galii var. riedliana (Speer) U. Braun; Golovinomyces galii var. riedlianus (Speer) V. P. Gelyuta; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Erysiphe riedliana Speer. Type: Erysiphe riedliana Speer.

Taxonomic Literature: Taxonomic notes: +mycelium evanescent to persistent, persistent rests of the mycelium turning brown, some conidia and conidiophores also included in the formation of the persistent mycelium;+appressoria nipple-shaped;+conidiophores erect, foot-cells cylindric, followed by 1-2 shorter cells;+ascocarp outer wall cells obscure, irregularly shaped, 10-30 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [239-240] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Asia-Temperate, Europe (scattered; 6: USA, Canada), Northern America, and Asia-Tropical. Region(s): Siberia, Far Eastern Asia, Middle Asia, and China. Country or state(s): Japan; Pakistan; British Columbia (Canada), Montana (USA), Washington (USA), Wyoming (USA), Kansas (USA), Missouri (USA), Nebraska (USA), Wisconsin (USA), Connecticut (USA), California (USA), Maryland (USA), and Virginia (USA). Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on stems or leaves, amphigenous. Host or Phorophyte Taxonomy: Galium verum L.; Galium, Rubiaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, .085-.185 mm in diam.. Margin: External filaments present; interlaced with each other or interwoven with surrounding mycelium, mycelioid, straight, .25-2 µm long, 4-10 µm in diameter, pigmented (yellowish to deep brown throughout), numerous, growing all across the lower half of the ascocarp or on the upper half of the ascocarp (sometimes also), smooth or somewhat rough, thin, not ramified or ramified (rarely), not branched (irregularly branched) or irregular, septate.

Asci: 8-25 asci per ascocarp, distinctly stipitate, 50-85 µm long, (20)-25-40-(45) µm wide; dehiscence unitunicate.

Ascospores: 1–2 (spores developed before overwintering) per ascus, spores 2 per ascus, ellipsoid or ovoid, 18-30.5 µm long, 12-19 µm wide; septa absent.

Conidiomata: Present; hyphomycetous (included in the formation of the persistent mycelium).

Conidiophores: Euoidium-type; not branched; basal cells 50-85 µm long, 10-13 µm wide. Conidium Formation: Conidiogenous cells in chains. Conidia: Ellipsoid, doliiform, or sub-cylindrical; macroconidial, not branched, (20)-24-38 µm long, 14-16.5 µm wide; aseptate.

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