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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. (06-01-24); revised.

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

Taxonomic Literature: Taxonomic notes: +appressoria lobed;+conidiophores foot-cells cylindric, straight, followed by 0-2 shorter cells or cells of about the same length, second cells occasionally longer;+ascocarp outer wall cells irregularly polygonal, ca. 8-25 µm diam.;This variety differs from var. aquilegiae by appendage characters, see below. Braun U., Beih. Nova Hedwigia 89: 1-700 [208-210] (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 (USA, Canada, Alaska; 4,7: introduced), Southern America, and Asia-Tropical. Region(s): Siberia, Far Eastern Asia, Middle Asia, China, Australia, and New Zealand. Country or state(s): Denmark, Finland, United Kingdom, Norway, Sweden, Austria, former Czechoslovakia (incl. Czech Republic & Slovacia), Germany, Hungary, 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, Former Yugoslavia [incl. Bosnia and Herzegovina, Croatia, Macedonia, Moldova, Serbia and Montenegro, Slovenia], Belarus, Baltic States (Estonia, Lithuania, Latvia), and Ukraine; Japan and Taiwan; India; Tasmania; Alaska (USA).

Ecology: Biotroph; phytopathogenic; growing on stems, leaves, and petioles, amphigenous. Host or Phorophyte Taxonomy: Ranunculus cf. muricatus; Ranunculus, Ranunculaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered and gregarious, (.065)-.075-.115-(.125) mm in diam.. Margin: External filaments present (often unequal in length); interlaced with each other and interwoven with surrounding mycelium, mycelioid, straight, .5-4 µm long, few and numerous, growing at the ascocarp base and between the lower and upper hald of the ascocarp, flexuose and geniculate (bent) (to undulate), smooth and rough (sometimes faintly), thin, not ramified, septate.

Asci: (2)-3-8-(12) asci per ascocarp, not stipitate and indistinctly stipitate, 40-70-(80) µm long, 25-45-(55) µm wide; dehiscence unitunicate.

Ascospores: c. 4 and c. 8 per ascus, spores (2)-3-5-(6) per ascus, ellipsoid and ovoid, 16-25.5 µm long, 9-15 µm wide; septa absent; wall thin, hyaline (or faintly yellowish).

Conidiophores: Pseudoidium-type; not branched; basal cells (15)-20-38 µm long, 7-11 µm wide. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid and obovoid or sub-cylindrical; macroconidial (germ tubes usually on an end, short to moderately long, simple or terminating with a lobed appressorium), not branched, (25)-28-50 µm long, (12)-18-22-(24) µm wide; aseptate.

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