Compare with Diaporthe strumella.

Cheers, Hermann

Hi,

yes, there is e,g. a Diaporthe longisporum described from North American Ribes, with longer spores (15-23 x 3-4 µm). However, if your spores are just a little bit larger and wider (you don't give measurements...), this may be within the range of variability. And you have to consider that Wehmeyer (and others) measured the spores from herbarium specimens, where the spores are often distinctly smaller than in vital material, and you also have to consider that the size ranges of spores of Diaporthe can vary substantially depending on the development and maturity of the specimen. So, the published size ranges obtained from a few specimens often do not correctly mirror the natural variation.

But Diaporthe is a difficult genus...

Cheers,

Hermann

The dimensions of the spores are given in the photo with spores.