Thank you all for comments.
The bright field photografphs are relatively rare at this forum, so I've wanted to change it
Most of the most visually attractive images are usually taken with special techniques of lighting - DIC, darkfield, polarized light and Rheinberg.
If about my image the most important is fact that it was possible to catch these three stentors together. I've managed to get the sample with a lot of green stentors. Many of them were in division so I could observe this process.
Marek