Isoetes histrix

Rarity: Common

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What Wikipedia says

Isoetes histrix, the land quillwort, is an aquatic pteridophyte native to the Mediterranean region, northwestern Africa, and the coasts of western Europe northwest to Cornwall. It occurs mainly in temporarily wet habitats, otherwise called vernal pools.

Excerpt from the Wikipedia article “Isoetes histrix”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Peter de Lange, CC0, via Wikimedia Commons.