Erysiphe clethrae (U. Braun) U. Braun & S. Takam.

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-27). Data set reviewer(s): Schubert K. (06-03-23); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Microsphaera clethrae U. Braun; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera clethrae U. Braun. Type: Microsphaera clethrae U. Braun.

Taxonomic Literature: Taxonomic notes: +ascomata outer wall cells obscure, polygonal, ca. 10-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [419-420] (1987).

Biogeography: Continent: Asia-Temperate. Country or state(s): Japan (endemic).

Ecology: Biotroph; phytopathogenic; growing on leaves, hypophyllous (cleistothecia mostly) or amphigenous. Host or Phorophyte Taxonomy: Clethra barbinervis Siebold & Zucc.; Clethra, Clethraceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered, .07-.09 mm in diam.. Margin: External filaments present; not interlaced, recurved, .75-1.25 µm long, 6-9 µm in diameter, hyaline, few or numerous, 7-16 per mm², growing between the lower and upper hald of the ascocarp, stiff and straight, smooth or faintly rough (rarely), thin or thick (towards the base), ramified, dichotomously branched (4-6 times, branchings fairly loose, primary branches sometimes elongated, tips recurved), aseptate.

Asci: 2-4 asci per ascocarp, sub-globose (often), not stipitate or indistinctly stipitate (rarely), 40-55 µm long, 30-50 µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores 5-7 per ascus, subglobose, ellipsoid, or ovoid, 15-22.5 µm long, 10-14 µm wide; septa absent.

Conidia: Macroconidial.

(report generated 04.Okt.2007)