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Erysiphe discariae (Havryl.) U. Braun & S. Takam. [2000116]

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Schubert K. @EXCL@ Kainz C. (06-03-29).

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

Type Information: Basionym: Microsphaera discariae Havryl. Type: Microsphaera discariae Havryl.

Taxonomic Literature: Taxonomic notes: +peridium thin, asci and ascospores visible inside the ascocarp, peridial cells polygonal, ca. 17-19 µm diam.; +appressoria lobed, unilateral to opposite; +vegetative hyphae 4-7 µm wide. Havrylenko M., Nova Hedwigia 61: 447-455 (1995).

Biogeography: Continent: Southern America (Argentina, Prov. Neuquen).

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Discaria chacaye (G. Don) Tortosa; Discaria, Rhamnaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid (abundant), orbicular (depressed), forming independently from the host thallus or mycelium, gregarious, (.08)-.1-.12 mm in diam.. Margin: External filaments present; not interlaced, recurved or straight, 2-2.5 µm long, 6-8 µm in diameter, hyaline or pigmented (with yellowish basal part), few or numerous, 12-20 per mm², growing all across the lower half of the ascocarp (with a tendency to grow upwards, not horizontally spread), flexuose, smooth, thin, ramified, dichotomously branched (5 times), septate (mostly with a basal septum, but few with two septa, one at the base and the second remote, ca one third).

Asci: 3-4 asci per ascocarp, not stipitate or indistinctly stipitate, 40-56 µm long, 30-39 µm wide; dehiscence unitunicate.

Ascospores: c. 4 to c. 8 per ascus, spores 5-6 per ascus, broadly ellipsoid or ovoid, 16-19 µm long, 10.5-19 µm wide; septa absent.

Conidiomata: Present; hyphomycetous.

Conidiophores: Pseudoidium-type (foot-cells cylindrical, width increasing upwards, followed by one cell of the same length); not branched; basal cells 20-28 µm long, 8-12 µm wide. Conidium Formation: Conidiogenous cells single. Conidia: Doliiform or cylindrical; macroconidial (germ tubes simple, arising apically as seen in naturally germinated conidia on leaves), not branched, 25-33 µm long, 9-14 µm wide; aseptate.

(report generated 04.Okt.2007)

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