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Podosphaera clandestina (Wallr.) Lév. var. clandestina

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: Alphitomorpha clandestina Wallr. : Fr.

Taxonomic Literature: Taxonomic notes: +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, Australasia, Europe (all), and Northern America (USA, Canada; conidial states, maybe belonging to P. clandestina, are known from some additional areas, e.g. Australia, New Zealand, but they are sometimes doubtful and they need confirmation). Region(s): Siberia, Far Eastern Asia, Western Asia, and China. Country or state(s): Japan.

Ecology: Biotroph; phytopathogenic; 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, hyaline, (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, not branched (occasionally forked near the base or near the middle of the stalk) 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; wall thin, remaining hyaline, hyaline, not ornamented.

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: Ellipsoid, sub-cylindrical, ovoid, or doliiform; macroconidial, not branched, (20)-24-34-(36) µm long, 11-20 µm wide; aseptate; with distintly visible fibrosin body fibrosin bodies.

(report generated 04.Okt.2007)

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