This is Lobster mushroom (Russula brevipes host parasitised by ascomycete fungus Hypomyces lactifluorum) under the microscope, reflected light, 10x objective, horizontal field of view is about 1.2mm:
Here is the same view, but using transmitted light:
And here is a much closer look at the spores (100x objective, horizontal field of view is about 121 microns, the spores mounted in lactophenol cotton blue):
And this is the same picture as above, but digitally inverted with some color channels swapped:
If you like this image, prints and apparel available via Redbubble.
You can license the photos for commercial and personal use via Alamy: https://www.alamy.com/search/lightbox/4159370.html