In 2009 huge quantities of Ulva lactuca washed up on the beach at Saint Michel, causing the deaths of a horse and a cleanup crew truck driver.
In one incident near Saint-Michel-en-Grève, a horse rider lost consciousness and his horse died after breathing the seaweed fumes.
Lactuca | Ulva lactuca | Prickly Lettuce (''Lactuca serriola'') | Lactuca serriola | Lactuca perennis |