Algal flora of North-East Sardinia: the Tavolara and Molara. Islands and Molarotto Reef. Italy. Ist Note. The A. gives the results of a research on the seaweeds in North-East Sardinia (Tavolara and Molara Islands, Molarotto Reef), carried out by diving techniques with aqualungs. In the list of flora the particular level is given next to each species, corresponding to their presence in this area. Becouse 50 species only have been found, the A. proposes some explanations of this lack of taxonomic entities and divides them in three groups: mechanical (sea-stirring), physical (homogeneity of environmental conditions) and biological (destroying action of Echinoderms).