Mag. 400x (1, 3-5), 200x (2)
The first image is an extended view of the bulk of the colony. The 2nd image pictures the entire colony at 2 depths of field. The last images attempt to capture the cone and flagellum apparatus. Scanning the cells reveals that some individuals are stalked (perhaps all are). Video: https://youtu.be/fuYWVPUe3CA. These cells may be a member of genus Sphaeroeca, https://eol.org/pages/92841/media. Additional Refs.:
first photo of underside of leaf, second photo of topside