The slender seagrass is a plant, not a seaweed, and like other plants it has roots, stem, leaves, flowers and fruits.
It is widely distributed in the Mediterranean Sea, and in the North-eastern Atlantic Ocean from Southern Spain to the Canary Islands. It is present in sandy-muddy soils in protected sites. The period of maximum leafiness is between May and August, forming locally extensive meadows together with neptune seagrass (Posidonia oceanica) and dwarf eelgrass (Zostera nolti). It appears at depth ranges between 0 and 40m.
This plant plays a fundamental ecological role on the coast: stabilizes sediments, contributes to the recycling of elements, supports many species of algae, gives refuge and sustenance to many invertebrates and fish, being a breeding area for many species of fish.