Polysiphonia is an alga of class Rhodophyceae (red algae) in the plant kingdom.
| Kingdom | Plantae |
|---|---|
| Class | RhodophyceaeRed algae |
| Common name | Red alga |
| NCERT | Class 11 Biology, Chapter 3: Plant Kingdom |
Rhodophyceae: Red pigment r-phycoerythrin; food stored as floridean starch; mostly marine, often in deep water.
| PorphyraLaver, a red alga | RhodophyceaeEaten as food. |
| GracilariaRed alga | RhodophyceaeA source of agar. |
| GelidiumRed alga | RhodophyceaeA source of agar. |