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Pleochaeta polychaeta (Berk. & M. A. Curtis) Kimbr. & Korf

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. Data set reviewer(s): Schubert K. (06-04-05); revised.

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

Type Information: Basionym: Uncinula polychaeta Berk. & M. A. Curtis. Type: Uncinula polychaeta Berk. & M. A. Curtis.

Taxonomic Literature: Taxonomic notes: +conidiophores foot-cells twisted;+ascomata outer wall cells obscure, irregularly shaped, ca. 10-15 µm diam;. Braun U., Beih. Nova Hedwigia 89: 1-700 [571-572] (1987).

Biogeography: Continent: Northern America (southern states of the USA, Central America) and Southern America (nearly all). Country or state(s): Texas (USA) and Mississippi (USA).

Ecology: Biotroph; phytopathogenic; growing on leaves, hypophyllous. Host or Phorophyte Taxonomy: Celtis occidentalis L.; Celtis, Ulmaceae.

Reproduction Strategy: With sexual (and possible asexual) stages (large). Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, .2-.32 mm in diam.. Margin: External filaments present (somewhat attenuated towards the tip); uncinate (closely) or circinate, .25-.75 µm long, 3.5-6.5 µm in diameter, hyaline, very numerous (densely crowded around the fruit body), 150-250 per mm², growing somewhat on the upper half of the ascocarp, smooth, thick (throughout, coalescent), not ramified or ramified (seldom, forked in the lower half), not branched, aseptate.

Asci: 40-65 asci per ascocarp, distinctly stipitate, 70-90 µm long, 20-30 µm wide; dehiscence unitunicate (very numerous).

Ascospores: 1–2 per ascus, spores 2 per ascus, ellipsoid or ovoid, 25-35 µm long, 12-16 µm wide; septa absent.

Conidiomata: Present; hyphomycetous.

Conidiophores: Streptopodium-type; not branched. Conidium Formation: Conidiogenous cells single. Conidia: Ellipsoid (primary conidia more or less lanceolate, pointed apically, widest in the lower half), cylindrical, or clavate; macroconidial (dimorphic, two types of conidia), not branched, 50-75 µm long, 15-25 µm wide; aseptate.

(report generated 04.Okt.2007)

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