Erysiphe thuemenii U. Braun

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. Data set reviewer(s): Schubert K. (06-03-28); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Erysiphe communis f. potentillae Jacz. Type: Erysiphe communis f. potentillae Jacz.

Taxonomic Literature: Taxonomic notes: +ascocarp outer wall cells irregularly polygonal;. Braun U., Beih. Nova Hedwigia 89: 1-700 [215] (1987).

Biogeography: Continent: Asia-Temperate. Region(s): Siberia and Far Eastern Asia. Country or state(s): Kazakhstan.

Ecology: Biotroph; phytopathogenic; growing on leaves, hypophyllous (cleistothecia mostly) or amphigenous. Host or Phorophyte Taxonomy: Potentilla bifurca L.; Potentilla, Rosaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, not emerging (often, in the dense mycelial layer), .08-.11 mm in diam.. Margin: External filaments present (short, often shorter than the cleistothecial diam.); interlaced with each other, straight, numerous, growing all across the lower half of the ascocarp, not ramified, septate (few septa).

Asci: 6 asci per ascocarp, broadly clavate (-ellipsoid), indistinctly stipitate, 60-75 µm long, 25-50 µm wide; dehiscence unitunicate.

Ascospores: 1–2 to c. 4 per ascus, spores 2-4 per ascus, ellipsoid, 24-30 µm long, 10-16 µm wide; septa absent.

Conidiomata: Present; hyphomycetous.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Macroconidial, not branched, 26-31 µm long, 15.5-17 µm wide; aseptate.

(report generated 04.Okt.2007)