BioImages (UK)
BIOTA
(living things)
Eukaryota
(eukaryotes)
Unidentified organisms
(Identification invited)
Record
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BioImages: The Virtual Field-Guide (UK)

Unidentified organisms (Identification invited)

Date: 7 June 2005
Location: South Wiltshire, England
Record Summary: infection on underside of leaves of Greater Knapweed
Associated organism: underside live leaf of Centaurea scabiosa
Identification Notes: Seems to be associated with grazed patches.

Short chains of smooth featureless hyaline cells 15.5-20/20.5µm diam.

Possibilities:
1. gall (ie plant growth response to ?insect attack)
2. fungus (perhaps Albugo or related - the "spores" look nothing like "white rusts")

Images etc

naked eye photograph Infected leaf pinna - lower surface - enlarged 500 by 332 pixels
naked eye photograph Infected leaf pinna - upper surface - enlarged 500 by 331 pixels
naked eye photograph Infected leaves 347 by 500 pixels
naked eye photograph Infection - leaf lower surface - highly enlarged 500 by 332 pixels
naked eye photograph Infection - leaf upper surface - highly enlarged 500 by 332 pixels
naked eye photograph Infection - leaf upper surface - highly enlarged 500 by 462 pixels
naked eye photograph Infection - leaf under surface - highly enlarged 500 by 332 pixels
naked eye photograph Infection - leaf under surface - highly enlarged 500 by 441 pixels
microscope photograph Chains of cells - magnified 472 by 500 pixels
microscope photograph Chains of cells - magnified 500 by 364 pixels
microscope photograph Leaf surface - magnified 500 by 333 pixels

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