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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. (06-02-22); not revised.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Synonyms: Microsphaera grossulariae (Wallr.) Lev.; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Alphitomorpha penicillata (var.) grossulariae Wallr. Type: Alphitomorpha penicillata (var.) grossulariae Wallr.

Taxonomic Literature: Taxonomic notes: +appressoria lobed; +conidiophore foot-cells cylindric, followed by two shorter cells;+ascomata outer wall cells irregularly polygonal, ca. 8-25 µm diam., conspicuous;. Braun U., Beih. Nova Hedwigia 89: 1-700 [335-337] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Asia-Temperate (Central Asia), Europe, and Northern America (USA: Mont., Nebr., N. H., Calif., Id.; Canada, fairly rare). Country or state(s): Denmark, Finland, United Kingdom, Norway, Sweden, Austria, Benelux (Belgium & Luxembourg), former Czechoslovakia (incl. Czech Republic & Slovacia), Germany, Hungary, Netherlands, Poland, Switzerland (incl. Liechtenstein), France (excl. Corsica), Bulgaria, Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia), Romania, Former Yugoslavia [incl. Bosnia and Herzegovina, Croatia, Macedonia, Moldova, Serbia and Montenegro, Slovenia], Belarus, Baltic States (Estonia, Lithuania, Latvia), and Ukraine; Idaho (USA), Montana (USA), Nebraska (USA), New Hampshire (USA), and California (USA).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Ribes uva-crispa L.; Ribes, Grossulariaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, .075-.105 mm in diam.. Margin: External filaments present (straight to curved); straight, 1-1.5 µm long, 5-10 µm in diameter, hyaline, few, 8-15-(20) per mm², growing between the lower and upper hald of the ascocarp, smooth, thin, moderatly thick, or thick (towards the base, rarely moderately thick-walled throughout), ramified, dichotomously branched (4-6 times, closely and regularly, branches of all orders short, branchings compact, appearance of the branchings digitate, tips straight, not recurved), aseptate or septate (1-2 septa near the base).

Asci: 3-8-(10) asci per ascocarp, not stipitate (rarely) or indistinctly stipitate, 50-65 µm long, 30-40 µm wide; dehiscence unitunicate.

Ascospores: c. 4 to c. 8 per ascus, spores 3-5-(6) per ascus, subglobose, ellipsoid, or ovoid, 20-33 µm long, 11-18 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid or cylindrical; macroconidial, not branched, (20)-23-33-(35) µm long, (11)-12-17.5 µm wide; aseptate.

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