Posidonia oceanica (commonly known as Neptune grass or Mediterranean tapeweed) is a seagrass species that is endemic to the Mediterranean Sea. It forms large underwater meadows that are an important part of the ecosystem. The fruit is free floating and known in Italy as "the olive of the sea" (l'oliva di mare). Balls of fibrous material from its foliage, known as egagropili, wash up to nearby shorelines.
Photo: @ilaria_leoni · iNaturalist · CC BY
Neptune Grass
Posidonia oceanica
- Observations in the area
- 12
- Last sighting
- 6 August 2025
- Category
- Plants
Species and sighting data come from the iNaturalist platform and may change over time.
Where it has been observed
More photos
Photo: @sjsaunders · iNaturalist · CC BY-NC
Photo: @scienzenaturali · iNaturalist · CC BY-NC
Photo: @scienzenaturali · iNaturalist · CC BY-NC
Photo: @scienzenaturali · iNaturalist · CC BY-NC
Photo: @flovh · iNaturalist · CC BY-NC
Photo: @dinobiancolini · iNaturalist · CC BY-NC
Photo: Falk Viczian Solarboot-Projekte gGmbH · iNaturalist · CC BY-NC
Photo: Luca Boscain · iNaturalist · CC BY-NC
Other species in the same category
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27 observations in the area
Photo: @coleiche · iNaturalist · CC BY-NC
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21 observations in the area
Photo: @giulia_artemisia · iNaturalist · CC BY-NC
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Large-fruited juniper
Juniperus macrocarpa
21 observations in the area
Photo: @Gregorio.gc · iNaturalist · CC BY-SA
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Mastic
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18 observations in the area
Photo: @anonymous · iNaturalist · CC BY-SA
Nature data: iNaturalist
Sighting data also come from open nature platforms and may change over time.