is a small purplish-red seaweed (up to 22 cm long) found on rocky shores and in pools. The fronds grow dichotomously from a narrow, unbranched stipe and are flat and wide with rounded tips. This seaweed is highly variable in appearance depending on the level of wave exposure of the shore and has a tendency to turn green in strong sunlight. Underwater, the tips of the frond can be iridescent.Also known as Irish moss. Together with Mastocarpus stellatus
, Chondrus crispus
is harvested commercially as carrageen to be used in the pharmaceutical and food industries. May be confused with Mastocarpus stellatus
, although the latter species has a rounded stipe, channeled fronds and papillate reproductive bodies.