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Erysiphe aggregata (Peck) Farl.

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. Data set reviewer(s): Schubert K. (06-01-24); revised.

Nomenclature: Current taxonomic status: accepted. Taxonomic rank: species. Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Erysiphella aggregata Peck.

Taxonomic Literature: Taxonomic notes: +ascocarp outer wall cells obscure, irregularly polygonal, 10-25 µm diam.;. Braun U., Beih. Nova Hedwigia 89: 1-700 [186] (1987).

Biogeography: Continent: Northern America (USA, northeastern to north central states, Me. to N.J. and N.Y., westward to O., Mich. and Minn.; Canada). Region(s): Eastern Canada, North-Central U.S.A., and North-eastern U.S.A. Country or state(s): New Brunswick (Canada), Ontario (Canada), Washington (USA), Minnesota (USA), Wisconsin (USA), Maine (USA), Massachusetts (USA), Michigan (USA), New Hampshire (USA), New Jersey (USA), New York (USA), Ohio (USA), Pennsylvania (USA), Vermont (USA), West Virginia (USA), and California (USA). Checklist records: United States and Canada (continental).

Ecology: Biotroph; phytopathogenic; growing on inflorescences (on female catkins of Alnus spec.). Host or Phorophyte Taxonomy: Alnus serrulata (Ait.) Willd.; Alnus, Betulaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, gregarious, .13-.23 mm in diam.. Margin: External filaments present; interlaced with each other, mycelioid, straight, .5-2-(4) µm long, 4-8 µm in diameter, hyaline or faintly pigmented (yellowish to pale brown), few or numerous, growing all across the lower half of the ascocarp, smooth or rough, thin or moderatly thick (occasionally below), not ramified or ramified, not branched or irregular, septate.

Asci: 15-30 asci per ascocarp, distinctly stipitate, 60-115 µm long, 30-40 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 6-8 per ascus, subglobose, ellipsoid, or ovoid, 14-21 µm long, 10-16 µm wide; septa absent; wall thin, remaining hyaline, hyaline, not ornamented.

Conidiomata: Present; hyphomycetous.

Conidiophores: Pseudoidium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid; macroconidial, not branched, 18.4-26.2 µm long, 9.2-18.4 µm wide; aseptate.

(report generated 04.Okt.2007)

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