Irish Moss is tough, stringy and has yellow, red, or purple seaweed growing up to 6 inches tall along the northern Atlantic. The parts used are the whole entire seaweed, dried. UPC: 084783008019. Origin(s): Canada, United States. Latin Name(s): Chondrus crispus, Chondracanthus chamissoi. Also known as: Carragheen, Carrageenan. Plant Part(