A page of pond algae
Note the fibrils extending through the gelatinous envelope in the Tetraspora colony. Many of the common algae in this pond have setae or chaetae: I wonder why?
Oedogonium species are characterised by the cell wall structure: cell division results in rings at the end of the cells. This is not so clear in some smaller species, but the cells tend to be slightly wider at one end than the other. The basal disc is found in all Oedogonium species, and some other genera (see the Tetraspora above)
Dr John Kinross