PROCESS FOR OBTAINING A UNIALGAL BIOMASS OF SMALL-SIZED PLURICELLULAR MACROALGAE CELLS AND HOST MACROALGAE ENDOPHYTES AND ITS USE IN COSMETICS

Process for obtaining a unialgal biomass of cells of small multicellular macroalgae and endophytes of host macroalgae， characterized in that it comprises the following successive steps: - A step A) of taking a sample from the natural environment said host macroalgae; - A step B) of preparing a unialgal sample of cells of said small multicellular macroalgae and endophytes of host macroalgae， by their separation from their said host macroalgae， from the sample taken in step A ) former ; - A step C) of culturing said unialgal sample of cells of small multicellular macroalgae and host macroalgal endophytes obtained in step B)， in sea water supplemented with at least one nitrogen source， to obtain an aqueous suspension of said unialgal biomass of small multicellular macroalgal cells; - A step D) of harvesting said unialgal biomass of cells of small multicellular macroalgae from said aqueous suspension obtained at the end of step C). Glycolic extract of said biomass， process for its preparation， its use in cosmetics and in pharmacy and compositions containing it.