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A green alga belonging to the genus Prasiola, known from terrestrial, marine and freshwater habitats of polar and cold-temperate regions, is recorded for the first time in the Mediterranean Sea. In 2002, during a survey on soft substrata in the Lagoon of Venice (Italy), specimens referable to this genus were found in several areas. The morphological features of thalli are described and their occurrence in the Lagoon of Venice is discussed. Data on associated algal vegetation are also presented. Un alga verde, perteneciente al género Prasiola conocida de hábitats terrestres, marinos y de agua dulce, se cita por vez primera en el mar Mediterráneo. En 2002, durante un monitoreo en sustratos blandos en la laguna de Venecia (Italia), fueron hallados en diversas áreas especímenes atribuibles a este género. Las características morfológicas de los talos son descritas y se discute su presencia en la laguna de Venecia. Se presentan datos sobre la vegetación algal asociada.

The recovery and the morphological description of a rare encrusting calcareous species Phymatolithon lenormandii (Areshoug) W. H. Adey (Corallinales, Rhodophyta) are reported for the Lagoon of Venice. This species may be considered endangered and vulnerable since it has not been yet signalled within the last two hundred years.