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Erysiphe alphitoides var. chenii (U. Braun) U. Braun & S. Takam.

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-26). Data set reviewer(s): Schubert K. (06-01-24); not revised (00-08-07).

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: variety. Synonyms: Microsphaera alphitoides var. chenii U. Braun; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Microsphaera alphitoides var. chenii U. Braun. Type: Microsphaera alphitoides var. chenii U. Braun.

Taxonomic Literature: Taxonomic notes: +conidiophores foot-cells cylindric, straight, occsionally foot-cells curved, followed by 1-3 shorter cells, sometimes followed by cells of about the same length;+appressoria lobed;+ascomata outer wall cells irregularly polygonal, ca. 8-25(-30) µm diam.;This variety differs from var. alphitoides by ascomata characters, see below. Braun U., Beih. Nova Hedwigia 89: 1-700 [388] (1987).

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

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous, causing the growth of galls. Host or Phorophyte Taxonomy: Quercus chenii Nakai; Quercus, Fagaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, (.07)-.08-.115 mm in diam.. Margin: External filaments present; mycelioid or setiform, recurved (tips of the ultimate branchlets), (1)-1.5-2.5-(3) µm long, few, 9-18 per mm², growing between the lower and upper hald of the ascocarp, flexuose (often), smooth or rough, thin (above) or thick (towards the apex), ramified, dichotomously branched (4-6 times, closely and regularly branched), septate.

Asci: 4-5 asci per ascocarp, not stipitate or indistinctly stipitate, 40-60 µm long, 35-45 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 6-8 per ascus, ellipsoid or ovoid, 15-25 µm long, 10-14 µm wide; septa absent.

Conidiomata: Present; hyphomycetous.

Conidiophores: Pseudoidium-type; basal cells 15-30 µm long, 6-9-(10) µm wide. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid, ovoid, doliiform, or sub-cylindrical (rarely); macroconidial (germ tubes at an end of the spores, short to moderately long, terminating in a lobed appressorium), 25-40 µm long, 13-23 µm wide.

(report generated 04.Okt.2007)

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