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Erysiphe necator var. ampelopsidis (Peck) U. Braun & S. Takam. [2017901]

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. (00-07-28). Data set reviewer(s): Schubert K. (06-03-02); not revised (00-08-08).

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: variety. Synonyms: Uncinula necator var. ampelopsidis (Peck) U. Braun; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Uncinula ampelopsidis Peck. Type: Uncinula ampelopsidis Peck.

Taxonomic Literature: Taxonomic notes: This variety differs from var. necator by ascomata characters, see below.+conidiophores foot-cells characteristically twisted, flexuous, length variable, followed by 1-3 shorter cells, sometimes a long and 1-2 short cells;+appressoria lobed;+ascocarp outer wall cells polygonal to rounded, ca. 10-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [465-467] (1987).

Biogeography: Northern hemispheric. Continent: Northern America (USA, Canada). Country or state(s): Ontario (Canada), Colarado (USA), Illinois (USA), Iowa (USA), Kansas (USA), Minnesota (USA), Missouri (USA), North Dakota (USA), Nebraska (USA), South Dakota (USA), Wisconsin (USA), Connecticut (USA), Indiana (USA), Massachusetts (USA), Michigan (USA), New Jersey (USA), New York (USA), Ohio (USA), Pennsylvania (USA), Rhode Island (USA), Vermont (USA), West Virginia (USA), Alabama (USA), Tennessee (USA), and District of Columbia (USA). Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on leaves or fruits, amphigenous. Host or Phorophyte Taxonomy: Parthenocissus quinquefolia (L.) Planch.; Parthenocissus, Vitaceae.

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-.13 mm in diam.. Margin: External filaments present (width subequal throughout or somewhat increasing upwards); uncinate (loosely or closely), circinate, or sub-helicoid, .75-2.5 µm long, 5-13 µm in diameter, hyaline or pigmented (in the lower half), numerous, (6)-10-30-(35) per mm², growing between the lower and upper hald of the ascocarp, stiff and straight, not ramified, septate (mostly 2-5 septa).

Asci: 4-8-(10) asci per ascocarp, not stipitate or indistinctly stipitate, 40-75 µm long, 25-45 µm wide; dehiscence unitunicate.

Ascospores: c. 4 or c. 8 per ascus, spores 4-6 per ascus, ellipsoid or ovoid, 15-24 µm long, 9-15 µm wide; septa absent.

Conidiomata: Present; hyphomycetous.

Conidiophores: Pseudoidium-type; not branched; basal cells 25-160 µm long, 5-9 µm wide. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid, ovoid, or doliiform; macroconidial, not branched, 22.5-48 µm long, 12-22 µm wide; aseptate.

(report generated 04.Okt.2007)

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