CHRYSONEPHOS LEWISII (SARCINOCHRYSIDALES, CHRYSOPHYCEAE), A NEW RECORD FOR THE MEDITERRANEAN ALGAL FLORA

Chrysonephos lewisii (Taylor) Taylor, belonging to the order Sarcinochrysidales (Chrysophyceae), is reported from the Tuscan coastline. Previously only reported from the Bermuda Islands and Florida, this is the first record from the Mediterranean. Vegetative and reproductive morphology, habitat and seasonal pattern of the plants are outlined, together with some ultrastructural features of the vegetative cells.