Common Name: Sieve Kelp/Shotgun Kelp

Scientific Name: Agarum clathratum

Location found: Washed up on Canoe Beach in Nahant, MA.

Habitat type: A. clathratum is found from the intertidal to depths of 15 m. It most commonly grows on rock in semi-protected areas. It is found globally, including both coasts of the Pacific and Atlantic Oceans.

Physical description: A. clathratum is a brown algae with a wide midrib and a stipe up to 30 cm long. The distinctive blade has holes scattered throughout its surface.

Fun fact: Reproductive patches of the kelp are called sori and are located towards the edge of the blade.

Source: http://www.seaweedsofalaska.com/species.asp?SeaweedID=18; http://www.marinespecies.org/aphia.php?p=taxdetails&id=157207#distributions