Ulva linza

Ulva linza

Ulva linza is one of the larger species of Ulva, able to reach up to 45 centimeters in length.  The plant is composed of clusters of long, unbranched, bright green ribbons about 5 centimeters wide and two cells thick with ruffled edges.  Each blade of Ulva linza tapers into a small distinct tubular stipe which then cluster into a common holdfast area, and blade surfaces are uniquely smooth, often described as "silky."  Ulva linza is a common species in intertidal to shallow subtidal areas attached to any available substrate from pebbles to bedrock, often found in tidepools, but preferring more protected habitats than other species of Ulva. Tolerant of a wide range of salinities, Ulva linza is often found in estuary areas or places with freshwater run-off.

Image Gallery

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underwater photo of Ulva linza seaweed by Dr. Gary W. Saunders
closeup photo of Ulva linza seaweed by Anne Frijsinger and Mat Vestjens
photo of finger pointing at Ulva linza seaweed on rocks by Dr. Gary W. Saunders



breed darmwier, bright grass kelp, flacher Darmtang

Phylum Classification 
Geographic Distribution 

Ulva linza is found worldwide in bays and sheltered coasts.


Ulva linza is used as an edible seaweed in many cultures for its high nutrient content and silky texture.  Green algae extracts are also very nutrient rich and make a beneficial addition to natural cosmetic products.


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Harvesting Techniques 

Ulva linza can be collected by hand from wild stocks at low tide, making sure to leave the basal portion attached to the substrate so that the plant can re-grow.


Ulva linza, like all species of Ulva, is a fast-growing, opportunistic seaweed.  If kept in check by herbivory and clean water, Ulva linza is an important primary producer in intertidal ecosystems.  However, when nutrient levels increase, often due to pollution, Ulva linza can grow to nuisance levels and from macroalgal blooms referred to as "green tides."