The Voynich Ninja

Hi everybody,
I'm new here and have much to learn so please go easy on me 

Just a thought I had about the F (You are not allowed to view links. Register or Login to view.) and the B:
If the lowercase letters might be color coding which indicate German origin,
then the uppercase might be indicating the plant part, in a German language.
In this case, F for frucht (fruit) and B for blatt (leaf)

Is there any other example for such annotation?

Welcome, kitsune! 
It's a possibility, I think, though perhaps not necessarily in German German. I'm saying this because 'rot' is the word for "root" in North-Germanic languages. In fact the English word 'root' was introduced by Northern invaders.

'F' could be fruit or flower in a whole bunch of languages as well.