Lamina (algae)

The lamina or blade in macroscopic algae, like seaweed, is a generally flattened structure that typically forms the principal bulk of the thallus.^[1] It is often developed into specialised organs such as flotation bladders and reproductive organs.^{[citation needed]}

Several kelp laminae

The lamina is typically an expansion of the stipe which in term is attached to the substrate by the holdfast.^[2]