1. Beneath these kelps, a benthic assemblage of foliose red algae may occur. 2. However, preparations from red algae yield also ( ?? ) 6 hexamer. 3. Some of its constituents likely represent red algae , whereas others resemble lichens. 4. Most red algae are also multicellular, macroscopic, marine, and reproduce sexually. 5. A similar sexual cycle is present in the red algae ( Rhodophyta ). 6. Approximately 5 % of the red algae occur in freshwater environments. 7. A . The rusty-looking stain is probably from red algae . 8. Small green and red algae and animals occur, protected under these large brown algae. 9. Similarly, it replaces the inner fibrillar cell-wall layer of cellulose in some red algae . 10. Aquatic plants are represented by red algae , " Halimeda ", seagrass, and plant plankton.