isoetes flaccida, three sisters spring, crystal river, citrus county, florida 1
This image was taken underwater. The species identification of this Isoetes is pending. I found many of them growing among roots under water up to a meter deep. For more information on the recorded species in Florida: florida.plantatlas.usf.edu/Results.aspx
Thanks very much to Neil Luebke, Curator of Botany, Milwaukee Pubilc Museum for the positive identification.