Occurrence of silica in brown and green algae

摘要: Small but significant amounts of silica occur in all brown algae and green Hydrodictyaceae examined. At least the hydrodictyaceous Pediastrum Tetraedron, predominates cell wall. This is largely isotropic, non-crystalline opal with a small amount α-quartz. Occurrence constitutes yet another feature suggesting phylogenetic relationships Chrysophycophyta, siliceous walls facilitate an understanding both nature organic substances present process zoosporogenesis.