Fig. 134.
Xanthidium.
Fig. 135.
Staurastrum.
Fig. 136.
Euastrum.
Fig. 137.
Cosmarium.
298. The desmids also belong to the same group. The desmids usually live as separate cells. Many of them are beautiful in form. They grow entangled among other algæ, or on the surface of aquatic plants, or on wet soil. Several genera are illustrated in [figures 132-137].