Casey Williams is an botanist and plant ecologist specializing in aquatic plants - both plants that grow completely submerged and which can emerge above the water surface. In this episode, we discuss : -the stresses facing plants that grow underwater,  -being limited by CO2 availability instead of water availability,  -the endangered Texas Wild Rice,  -how limestone geology influences aquatic plant growth by making CO2 more abundant,  -utilizing aquatic plants and the fungi that grow on them for bioremediation and treating sewage at the local shitplant  -how some aquatic plants have adapted to a paucity of dissolved carbon dioxide by supplementing with bicarbonate, -aquatic plants in deserts, and -how one plant in particular has utilized an evolutionary strategy more frequently employed by desert plants  (CAM) as a way to cope with fluctuations in CO2 availability.  Books referenced which can be downloaded off libgen.is :  Wetland Plants by Cronk Aquatic Photosynthesis by Falkowski