in leaf

Descrission:

Chroococcus (crow-owe-cock-us) tentative identification. Coccoid blue green algal cells. Found as one of several cyanobacterial epibionts on the leaves of the moss Hygrohypnum, a site which seems to be a focus for nitrogen fixation. In this case the cyanobacterial cells have occupied one of the cortical cells of the plant. Differential interference contrast.