Very common on the Umbilicus rupestris here. They form longitudinal ragged tears in the epidermis. I thought when I photographed they might be incipient Puccinia umbilici, but I could find no spores in my sample later. Do please correct me on this!
Observed on Rowan tree foliage.
In Tambo Rec. Growing on a type of plum. Most of fruits affected.
On Turkey Oak (Quercus cerris)
On Turkey Oak (Quercus cerris)