This study of coarse-grained intra-basaltic segregations (pegmatoids and amphibole-rich segregations similar to Philpotts's (1972) ocelli) rejoins the conclusions by Tomkeieff (1929) about pegmatoids as being evidence of immiscibility between dry and wet melt fractions. Such segregations are natural examples of hydrous basic melts. Their appearance inside the parent basic magma may be attributed to a fluid-induced separation process, and their composition depends directly on that of the intervening 'supersaturating' fluid phase. Differentiation at the liquid stage is thus unequivocally acknowledged, while the ability of such hydrous basic melts to internally differentiate is also most remarkable.