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Podosphaera clandestina var. aucupariae (Erikss.) U. Braun

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

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

Type Information: Basionym: Podosphaera aucupariae Erikss.

Taxonomic Literature: Taxonomic notes: This variety differs from var. clandestina by shape and size of

conidia, see below;
+conidiophores foot-cells cylindric, slender,
often slightly attenuated at the very base, followed by 1-5 shorter
+appressoria nipple-shaped;
+ascocarp outer wall cells
distinct, irregularly polygonal to rounded, ca. 8-25(-30) µm
Braun U., Beih. Nova Hedwigia 89: 1-700 [149-151] (1987); Braun U., The powdery mildews (Erysiphales) of Europe.- 1-337. Jena, Stuttgart, New York (1995).

Biogeography: Continent: Asia-Temperate and Europe. Country or state(s): Denmark, Finland, United Kingdom, Norway, Sweden, Austria, former Czechoslovakia (incl. Czech Republic & Slovacia), Germany, Netherlands, Poland, Switzerland (incl. Liechtenstein), France (excl. Corsica), Italy (incl. San Marino & The Vatican City, excl. Sicily, Sardinia), Romania, Belarus, Baltic States (Estonia, Lithuania, Latvia), and Ukraine.

Ecology: Biotroph; phytopathogenic; growing on leaves, amphigenous. Host or Phorophyte Taxonomy: Rosaceae.

Reproduction Strategy: With sexual (and possible asexual) stages. Ascocarps: Cleistothecioid, orbicular, forming independently from the host thallus or mycelium, scattered or gregarious (dense groups of ascocarps often forming dark patches on the host leaves), .06-.11 mm in diam.. Margin: External filaments present (long and short appendages mixed on the same fruit body; often enlarged at the very base); (.75)-1-3-(3.5) µm long, 6-10 µm in diameter, pigmented (dark brown below (about 1/2-3/4 of the stalk), paler upwards, hyaline in the uppermost part), (4)-5-16-(25) per mm², growing between the lower and upper hald of the ascocarp, flexuose (longer ones sometimes), smooth, moderatly thick (throughout), not ramified or ramified (occasionally forked near the base or near the middle of the stalk), not branched or dichotomously branched, septate (ca. 1-8 septa, septa reaching the upper half, sometimes septate throughout).

Asci: 1 asci per ascocarp, sub-globose, not stipitate, (45)-50-80-(90) µm long, 40-70 µm wide; dehiscence unitunicate.

Ascospores: c. 8 per ascus, spores 6-8 per ascus, subglobose, ellipsoid, or ovoid, (15)-18-25-(30) µm long, 10-18 µm wide; septa absent.

Conidiomata: Present; hyphomycetous.

Conidiophores: Oidium-type; basal cells (35)-50-100-(125) µm long, 7.5-10-(11.5) µm wide. Conidium Formation: Conidiogenous cells in chains. Conidia: Broadly ellipsoid; macroconidial, not branched, (20)-26-(29) µm long, 12.5-17.5 µm wide; aseptate.

(report generated 04.Okt.2007)

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