Stroma may refer to: Stroma, Scotland, an island off the northern coast of Scotland Stroma (animal tissue), the connective, functionally supportive framework of a biological cell, tissue, or organ Stroma, the thick fluid found in between grana, which are stacks of thylakoid disks. Stroma's where the carbohydrate formation reactions occur in the chloroplast of plant cells undergoing photosynthesis. Stroma (mycology), the dense structural tissue that produces fruiting bodies; made of nonvegetat… (More on Stroma)