Subject: Why do plants vary stomata density not size?

I did a lab last week where I took impressions of the underside of leaves.  I
took some from the shade and some from the sun. What confused me was that only
the density changed, not the size. I have ideas about why the size did not
change but I am having trouble finding reliable sources to confirm. I would be
prefer places to go and read the research so I have a better background and
understanding. Thanks for any help! Liz

Re: Why do plants vary stomata density not size?