This likely makes this particularly impressive specimen of Fucus vesiculosus, also known as bladderwrack, the largest cloned organism in the world. Originally, scientists thought (via DNA sequencing) ...

Pereyra et al, An Evolutionary Mosaic Challenges Traditional Monitoring of a Foundation Species in a Coastal Environment—The Baltic Fucus vesiculosus, Molecular Ecology (2025). DOI: 10.1111/mec.

The two species in question are common bladderwrack (Fucus vesiculosus) and narrow wrack (Fucus radicans), the latter of which was thought to be a prevalent species in the Gulf of Bothnia ...