Factsheets for Red Seaweeds (phylum Rhodophyta)

Genus: Iridaea Trade name: radula Symbol: IR
AuthorityBory de Saint-Vincent Type species: Iridaea cordata (Turner) Bory de Saint-Vincent 
Commercial species:  ciliata (CIL), edulis (EDL), laminarioides (LAM), membranacea (MEM)
Common names: Carrageenan, Carrageenan, Dulse, Ginnanso, Radula
Classification: Eukaryota, Phylum Rhodophyta, Class Rhodophyceae, Subclass Florideophycidae, Order Gigartinales, Family Gigartinaceae. 
AlgaeBase names and species:  71 names - 11 current as of 12-2001.
Comprehensive lists of common names , generic & specific names can be found at AlgaeBase. >>Click here<<  for SuriaLink's policy on names.
SuriaLink SeaPlant Utility Rating
Notable wild crop used for food & galactans
Harvesting must use good  environmental practices.
Thalli in loose with conspicuous blades 20-40 cm wide. Stipe if variable length. Blades cordate to broadly lanceolate. Colour dark red to purple sometimes with brown overtones or a blue iridescence. Margins of blades often split or ruffled. Blades mostly smooth and rubbery except bumpy when fertile Morphology widely variable within and among species.
Abundant on exposed, rocky coasts in low intertidal to subtidal zones to about 7m.

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Iridaea production
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Tons per annum
wild harvest
Tons per annum
Chile 5,606 0
Iceland n/a 0


5,606 0
Approximate annual production figures from recent years are as above.
Biology & Agronomy
In preparation.
In preparation.
We have several monographs in progress covering analytical procedures post-harvest treatment and process technology. Check the processing index for available web pages and monographs. 
Products, Uses & Applications
List of species' uses and community affiliations
Genus GenID SpID Species Uses Communities
Iridaea IR CIL ciliata FH, FI, IA, MD, PA, PC, WB BP, CA SV, WB
Iridaea IR EDL edulis FH, FI, IA, MD, PA, PC, WB BP, CA SV, WB
Iridaea IR LAM laminarioides FH, FI, IA, MD, PA, PC, WB BP, CA SV, WB
Iridaea IR MEM membranacea FH, FI, IA, MD, PA, PC, WB BP, CA SV, WB

click to relevant uses or communities on the index/legend table below>>>

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Iridaea is most strongly associated with the Biopolymer,  Seavegetables, and  Wellbeing communities.
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