The red algae, or Rhodophyta are one of the oldest groups of eukaryotic algae. Approximately 5% of the red algae occur in freshwater environments. Several species are important food crops, in particular members of the genus Porphyra, variously known as nori (Japan), gim (Korea), or laver (Britain). Dulse (Palmaria palmata) is another important British species. These … [Read more...]