Hows about we start a thread of links to marine plant articles and information, applicable to reef/lagoon/seagrass tanks, that can be found on-line? Maybe Bill will sticky it and we can add new stuff as we find it. Here are a few basic sites I know of:
Smithsonian (Fort Pierce) Seagrass Habitat Page Be sure to follow the links to seagrass specie descriptions at the bottom of the page. Also has an extensive bibliography. Very good seagrass site.
Smithsonian (Fort Pierce) Mangrove Habitat Page
U of Ireland Seaweed Site Home of a searchable algaebase for seaweeds.
One more, pretty academic, but very interesting from the perspective of cultivating macroalgaes to absorb primary nutrients:
Nitrogen-vs phosphorous limited growth and sources of nutrients for coral reef macroalgae