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.