Erysiphe guarinonii (Briosi & Cavara) U. Braun & S. Takam.

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. Data set reviewer(s): Schubert K. (06-01-25); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Microsphaera guarinonii Briosi & Cavara; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera guarinonii Briosi & Cavara. Type: Microsphaera guarinonii Briosi & Cavara.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells irregularly polygonal, ca. 10-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [352-353] (1987); Braun U., The powdery mildews (Erysiphales) of Europe. - 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Europe (especially in the Mediterranean region). Region(s): Middle Europe, South-western Europe, South-eastern Europe, and East Europe. Country or state(s): Denmark, Austria, Germany, Hungary, Poland, Switzerland (incl. Liechtenstein), France (excl. Corsica), Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia), Former Yugoslavia [incl. Bosnia and Herzegovina, Croatia, Macedonia, Moldova, Serbia and Montenegro, Slovenia], Belarus, Baltic States (Estonia, Lithuania, Latvia), and Ukraine.

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Laburnum anagyroides Medik.; Laburnum, Leguminosae-Papilionoideae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, gregarious, .09-.15 mm in diam.. Margin: External filaments present; interlaced with each other (often, and with the appendages of the surrounding ascocarps), mycelioid or setiform, recurved (primary branches usually elongated, often somewhat recurved, tips of the ultimate branchlets mostly recurved when mature), 6-12 µm long, (4)-6-8 µm in diameter, hyaline, numerous, 6-20 per mm², growing more or less between the lower and upper hald of the ascocarp or on the upper half of the ascocarp (somewhat), flexuose, thin or moderatly thick (towards the base), ramified, dichotomously branched (3-4(-5) times, branchings loose, primary branches usually elongated, often somewhat recurved, tips of the ultimate branchlets mostly recurved when mature, branchings often rather regular), aseptate.

Asci: 5-10 asci per ascocarp, indistinctly stipitate (usually), 50-70 µm long, 30-50 µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores 4-6-(8) per ascus, more or less ellipsoid, 20-25 µm long, 10-14 µm wide; septa absent.

Conidiomata: Absent resp. not observed.

(report generated 04.Okt.2007)