Maltawildplants.com is now considered an online flora of the Maltese islands, portraying more than 900 species of plants found in Maltese habitats. It harbours a forum created in 2005 were memberes discuss topics about the Maltese flora and ID of plants.
hint: these are the fruits of a flowering plant. they are seen only on rare occasions.... to photograph the plant in its natural habitat you would need some special equipment
Yes the Mediterranean endemic Posidonia oceanica
fruits hadnt been seen for quite a few years. Some two years ago though they were all over sandy beaches
here are some more photos (reduced in size)