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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. Data set revised.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Synonyms: Sphaerotheca erodii (Dur. & Mont.) Rayss; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Taxonomic Literature: Taxonomic notes: +ascoc. outer wall cells irregularly polygonal to rounded, fairly

conspicuous, 8-30(-35) µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [116] (1987); Braun U., The powdery mildews (Erysiphales) of Europe.- 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Africa, Asia-Temperate, and Europe. Region(s): South-western Europe and South-eastern Europe. Country or state(s): Corsica (France), France (excl. Corsica), Portugal, Spain (incl. Andorra & Monaco), Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia), European Turkey, and Former Yugoslavia [incl. Bosnia and Herzegovina, Croatia, Macedonia, Moldova, Serbia and Montenegro, Slovenia]; Canary Islands (Spain); Kazakhstan and Israel & Palestine (Israel).

Ecology: Biotroph; phytopathogenic; growing on petioles, amphigenous. Host or Phorophyte Taxonomy: Geraniaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered, sometimes gregarious, or in loose groups, (.06)-.08-.11-(.13) mm in diam.. Margin: External filaments present; interlaced with each other, mycelioid (undulate-geniculate, irregular), .5-2.5 µm long, (3)-4-9-(12) µm in diameter, hyaline (later coloured, brown thoughout or mostly paler upwards) or pigmented, growing all across the lower half of the ascocarp, geniculate (bent) (undulate-), smooth, thin, not ramified, not branched (or irregularly branched, branchings sometimes rather frequent), septate.

Asci: 1 asci per ascocarp, 50-80 µm long, 45-65 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 6-8 per ascus, subglobose (often) or ellipsoid (sometimes), 11-22.5-(25) µm long, 9.5-16-(18) µm wide; septa absent; wall thin, remaining hyaline, hyaline, not ornamented.

Conidiophores: Oidium-type; not branched. Conidium Formation: Conidiogenous cells in chains. Conidia: Cylindrical or ovoid; macroconidial, not branched, 18-30 µm long, 12-20 µm wide; aseptate; with distintly visible fibrosin body fibrosin bodies.

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