Unlike marine algae, freshwater algae is usually little more than green slime. Much of it is actually microscopic single-celled organisms that form the base of the food chain. That is why the water is green ( when it is green. ) *
Fanwort is a fully aquatic true plant. It grows steadily through the warm months, and can choke-out large areas, then dies back in the winter. Fanwort produces tiny flowers above the surface.
Sedges and Reeds are superficially similar, but actually quite different. But unless you are a biologist - who cares? ( Reeds are grasses, sedges are sedges. )
Sedges
Sedges tolerate a wide range of salinity, from freshwater to seawater, although they seem to grow best in brackish water. So, like above, if you are exploring a bay or inlet, that stuff all around you is most likely sedge.
Water Lilies are found in all still and slow-flowing freshwaters. One thing that I have noticed about them is that on any lake or pond, you will always find white ones, and usually also pink or yellow ones, but never both. The flowers begin in summer and last well into fall.
This small lake is about a mile long. The only public launch is at the west end in Stevenson Park, off West Front Street. There is a channel from there to the lake, but good luck finding it - be prepared to run aground. Fortunately, the bottom is firm sand, and a short tow on foot will get you out to deeper water. It is also possible to go a short ways up the creek.