I work with Arabidopsis, and I have noticed that some of my samples have this structure on their surfaces, as can be seen in SEM photographs attached. It seems a kind of fungus, and it looks that it appears preferently in or near stomata, although not always. The most shocking thing is that I have seen it even in plants grown in sterile conditions. I would like to know what this might be, and how could I get rid of it.
I really appreciate any help you can provide.