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Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (06-01-12). Data set reviewer(s): Schubert K. (06-03-27); revised.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Synonyms: Microsphaera russellii Clinton; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera russellii Clinton. Type: Microsphaera russellii Clinton.

Taxonomic Literature: Taxonomic notes: appressoria multilobed, conidiophores erect, slender, 3-4-celled, lenght variable, in shorter conidiophores the foot cell is the longest cell, longer conidiophores (longer than 100 µm) possess a very long second cell of about 45-90 µm, foot-cells cylindrical;+ascocarp outer wall cells irregularly shaped, ca. 8-22,5 µm diam. Braun U., Beih. Nova Hedwigia 89: 1-700 [295-296] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Africa, Asia-Temperate, Australasia, Europe, and Northern America. Region(s): Southern Africa, China, Australia, New Zealand, and North-eastern U.S.A. Country or state(s): Denmark, United Kingdom, former Czechoslovakia (incl. Czech Republic & Slovacia), Germany, Hungary, Poland, Romania, Baltic States (Estonia, Lithuania, Latvia), North-western Russia, and Ukraine; Korea (North & South) and Taiwan; Oregon (USA), Washington (USA), Iowa (USA), Kansas (USA), Minnesota (USA), South Dakota (USA), Maine (USA), Ohio (USA), and West Virginia (USA). Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Oxalis sp.; Oxalis, Oxalidaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, (.07)-.08-.11-(.12) mm in diam.. Margin: External filaments present; mycelioid, straight, 2-7 µm long, 5-9 µm in diameter, pigmented (coloured throughout when mature, brown, sometimes paler upwards), few, 5-15 per mm², growing between the lower and upper hald of the ascocarp (equatorially or subequatorially), flexuose, smooth or faintly rough (below), thin or thick (at the base), not ramified or ramified, dichotomously branched (1-4 times, branchings loose, lax, diffuse, deep, tips straight, not recurved), septate.

Asci: (4)-10 asci per ascocarp, not stipitate (rarely) or indistinctly stipitate, (30)-40-55 µm long, (20)-25-35 µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores 3-5 per ascus, subglobose, ellipsoid, or ovoid, (12)-15-22 µm long, 10-14 µm wide; septa absent.

Conidiophores: Pseudoidium-type; not branched; conidiophore cells 45-160 µm long, basal cells 22.5-70 µm long, 4-6 µm wide. Conidium Formation: Conidiogenous cells single. Conidia: More or less ellipsoid; macroconidial (germ tubes on an end, ca. 17,5-70 x 3,5-4,5 µm), not branched, 25-40 µm long, (11)-12.5-16-(20) µm wide; aseptate.

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