This is a great website with information about algae. I found it while trying to figure out where in the heck a thin leafy green algae like "sea lettuce" (Ulva/Enteromorpha) hid its reproductive structures or cells, especially since both gametophyte and sporophyte life stages look so similar. Check it out. There are even recipes!
You can choose to "enter Enteromorpha" if you dare, by clicking here: