Kelp
Kelps are large brown algae seaweeds that make up the order Laminariales. There are about 30 different genera.
Alaria (alga)
"Alaria" the second largest genus of Laminariales, with about 17 currently recognized species. However, due to its highly plastic morphology, the kelp has over 100 specific and subspecific names, which have arisen since it was first described in 1830. These synonyms have been tailored down to the present species through genetic comparisons.