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Podosphaera astragali (L. Junell) U. Braun & S. Takam.

Data Set Maintenance: Data set compiled and standard item. Data set author(s): Kainz C. Data set revised.

Nomenclature: Current taxonomic status: accepted or basionymous. Taxonomic rank: species. Synonyms: Sphaerotheca astragali L. Junell; Erysiphaceae Tul. & C. Tul.; Erysiphales.

Type Information: Basionym: Sphaerotheca astragali L. Junell ??

Taxonomic Literature: Taxonomic notes: +conidiophores foot-cells cylindric, followed by 1-2 shorter

+appressoria nipple-shaped;
+ascoc. outer wall cells

conspicuous, rather regular, polygonal, ca. 15-40 µm diam.;.
Braun U., Beih. Nova Hedwigia 89: 1-700 [135-136] (1987); Braun U., The powdery mildews (Erysiphales) of Europe.- 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Asia-Temperate, Europe, and Northern America (USA, Canada, Alaska). Region(s): Siberia (northern districts, Magadan region) and Far Eastern Asia. Country or state(s): Finland, Norway, Sweden, Germany, Romania, Belarus, Baltic States (Estonia, Lithuania, Latvia), and Ukraine.

Ecology: Biotroph; phytopathogenic; growing on stems or leaves, amphigenous (the persistent mycelium is hyaline or turns to yellowish or brownish and often forms (together with the long, brown appendages) a dense, coloured felt around the groups of ascocarps, strongly infected leaves and stems are often covered by dark brown patches or coats). Host or Phorophyte Taxonomy: Leguminosae-Papilionoideae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious, .065-.09 mm in diam.. Margin: External filaments present (well developed, length variable, long and short appendages on the same ascocarp); mycelioid (often coarse, easily broken off), .5-5 µm long, 4-8.5 µm in diameter, pigmented (throughout when mature, sometimes brown below and paler upwards), few or numerous, growing all across the lower half of the ascocarp, smooth, thin, not ramified or ramified (sometimes), irregularly not branched, septate.

Asci: 1 asci per ascocarp, 50-80 µm long, 45-60 µm wide; dehiscence unitunicate.

Ascospores: c. 8 (Bunkina, l.c., recorded ascospores of 26 x 17 µm) per ascus, spores 8 per ascus, subglobose, 13-20 µm long, 11-15 µm wide; septa absent.

Conidiomata: Present; hyphomycetous (conidiophores straight cylindric, followed by 1-2 shorter cells).

Conidiophores: Oidium-type; basal cells 50-70 µm long, 10-14 µm wide. Conidium Formation: Conidiogenous cells in chains. Conidia: Ellipsoid, cylindrical, or ovoid; macroconidial, not branched, 28-36 µm long, 12.5-19.5 µm wide; aseptate; with distintly visible fibrosin body fibrosin bodies.

(report generated 04.Okt.2007)

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