August 19th – The oaks are faring better this year for acorns. Last year, the crop here by the canal at Clayhanger, and over on Brownhills Common, was ravaged by knopper galls, which turn the oak fruit into odd-shaped aberrations that are home to the larvae of a tiny wasp. Thankfully, I could only see a handful of such curiously distorted acorns on this tree, which had a healthy looking crop of normal fruit maturing nicely.

What the tree was suffering, though, is unknown but fascinating. Leaves had inverted, and the undersides were covered with an annular ring, clearly left by fungi or some insect or other. They look like tiny breakfast cereal pieces, but are obviously killing the foliage.

Do any passing arborialists know what they are, please?