Mastocarpus stellatus, also called
Clúimhín Cait (cats' puff),
carragheen, or
false Irish moss, is a species of red algae closely related to Irish Moss, or
Chondrus crispus. It is collected in Ireland and Scotland, together with
Chondrus crispus as
Irish moss, dried, and sold for cooking and as the basis for a drink reputed to ward off colds and flu.
(Wikipedia)