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Gymnosporangium sabinae | by Martin Cooper Ipswich
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Gymnosporangium sabinae

Collection of images of the Pear Rust fungus found on a Pear tree in Christchurch Park (TM16464519) on 24 October 2015. ID confirmed by Keith Palmer of the British Plant Gall Society.

From left to right: Top row: red spot on surface of pear leaf, close-up of red spot, extreme close-up of the little black dots in the red spot (pycnia) formed by the initial infection.

Middle row: aecia on underside of leaf, close-up of aecia.

Bottom row: peridial threads from aecia, spores with measurements.

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Uploaded on October 30, 2015