Erysiphe friesii var. dahurica (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. (06-01-25); revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: variety. Synonyms: Microsphaera friesii var. dahurica U. Braun; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera friesii var. dahurica U. Braun. Type: Microsphaera friesii var. dahurica U. Braun.

Taxonomic Literature: Taxonomic notes: This variety differs from var. friesii by ascomata characters (see below).+conidiophores foot-cells straight to curved, rarely flexuous, followed by (1-)2-3 cellls of about the same length (or somewhat shorter or somewhat longer);+appressoria lobed;+ascomata outer wall cells obscure, irregularly polygonal, ca. 8-20 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [420-422] (1987).

Biogeography: Continent: Asia-Temperate. Region(s): Far Eastern Asia and China. Country or state(s): Japan and Korea (North & South).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Rhamnus davurica var. nipponica Makino; Rhamnus, Rhamnaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or in loose groups, .08-.105 mm in diam.. Margin: External filaments present; setiform, recurved (tips of the ultimate branchlets), .75-1.25 µm long, few or numerous, 7-15 per mm², growing between the lower and upper hald of the ascocarp, stiff and straight (or curved), smooth or rough, thin or thick (towards the apex), ramified, dichotomously branched (4-6 times, closely and regularly branched, tips recurved), septate.

Asci: 4-5 asci per ascocarp, not stipitate or indistinctly stipitate, 40-50 µm long, 25-45 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores (4)-5-7-(8) per ascus, subglobose, ellipsoid, or ovoid, 16-24 µm long, 9-12 µm wide; septa absent.

Conidiomata: Present; hyphomycetous.

Conidiophores: Pseudoidium-type; not branched; basal cells 15-32.5 µm long, 7.5-10 µm wide. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid or cylindrical; macroconidial, not branched, 27-40 µm long, 10-16.5 µm wide; aseptate.

(report generated 04.Okt.2007)