I have this diseases on some plants. Only on plants of the Micropedalum section with soft leaves. I don't think that these are insects bites, check them under the microscope and don't find something noticeable.
Thanks
Florian
I bought a „caricinum“ from popow wich never flowers right now. But i am sure its not the species. The real one has much more narrow leaves. Bought ist as a young plant and the Habitus looks like your plant.
I have a child plant of your clone, i think you can see the similarity. The Flower is bigger and the leaves are wider than other richteri. Nice to see the parent plant, thanks.
I hope its ok for you if i poste a photo of my plant.