It's a purplish, mucilaginous substance produced by those tiny buds known by the name trichodesmia, 40,000 of which are needed to occupy the space of one square millimeter.
Es una materia inucilaginosa, de color púrpura, producída por esas algas filamentosas llamadas Tricodesmias, tan diminutas que cuarenta mil de ellas apenas ocupan el espacio de un milímetro cuadrado.