Fucus radicans

Fucus radicans is a species of brown algae in the family Fucaceae, endemic to and recently evolved within the Baltic Sea. The species was first described by Lena Bergström and Lena Kautsky in 2005 from a location in Ångermanland, Sweden. The specific epithet is from the Latin and means "rooting", referring to the fact that this species primarily reproduces by the taking root of detached fragments.

Fucus radicans seems to have diverged from the closely related and widely distributed Fucus vesiculosus within about the last 400 years. It often reproduces clonally, which may have helped its rapid emergence as a new species. Genetic analysis supports the hypothesis of the recent divergence of Fucus radicans from Fucus vesiculosus as an example of sympatric speciation, with the two species presently occupying the same semi-marine territory.