First algae is likely to Sargassum natans

Second and third is maybe Sargassum vulgare

fourth is probably the Gelidiales order, Try use identification keys for Gelidium, Pterocladiella and Pterocladia for confirm the genus and specie.

Provide more photos with details of cuts or reproductive structures that facilitated the identification.

best regards

Thank you very much for you kind help, Levi Pompermayer Machado!

1, 2 & 3 is Sargassum  natans and S. vulgare

4- may be Gelidium corneum???

as Levi said need more detail for further identification???

 Third one belongs to Scrophulariaceae family and genus is veronica.