Erysiphe convolvuli var. dichotoma R. Y. Zheng & G. Q. Chen

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

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

Type Information: Basionym: Erysiphe convolvuli var. dichotoma R. Y. Zheng & G. Q. Chen. Type: Erysiphe convolvuli var. dichotoma R. Y. Zheng & G. Q. Chen.

Taxonomic Literature: Taxonomic notes: +appressoria lobed;+conidiophores foot-cells cylindric, followed by 2 shorter cells or cells of about the same length;+ascocarp outer wall cells irregularly polygonal to rounded, ca. 10-25 µm diam.;This variety differs from var. convovuli by appendage characters, see below. Braun U., Beih. Nova Hedwigia 89: 1-700 [221-223] (1987).

Biogeography: Continent: Asia-Temperate. Region(s): China.

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Convolvulus arvensis L.; Convolvulus, Convolvulaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, .09-.155 mm in diam.. Margin: External filaments present; mycelioid, straight, .5-5 µm long, 4-10 µm in diameter, hyaline or somewhat pigmented (in the basal half), numerous, growing all across the lower half of the ascocarp, smooth or faintly rough, thin, not ramified (seldom) or ramified, sub-dichotomously branched (often; +1-3(-5) times irregularly branched), septate.

Asci: 3-10 asci per ascocarp, not stipitate or indistinctly stipitate, 45-75 µm long, 30-45 µm wide; dehiscence unitunicate.

Ascospores: 1–2, c. 4, or c. 8 per ascus, spores (2)-3-4-(6) per ascus, ellipsoid or ovoid, 18-28 µm long, 11-18 µm wide; septa absent.

Conidiomata: Present (anamorph well developed); hyphomycetous.

Conidiophores: Pseudoidium-type; not branched; basal cells 25-36-(42) µm long, 7-10 µm wide. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid or cylindrical; macroconidial (germ tubes on an end, moderately long, simple, apex unlobed or slightly lobed), not branched, (25)-40-55-(65) µm long, 14-22 µm wide; aseptate.

(report generated 04.Okt.2007)