Are red algae edible?

Red Algae:

1. They are mainly marine forms that grow attached to rocky stones.
2. They are microscopic, unicellular forms.
3. The body can be simple, unicellular, filamentous, ribbon-or lace-like.
4. The cells are eukaryotic in structure.
5. Porphyra is the marine edible red algae that can be consumed.