What are the main characteristics found in red algae?

In addition, algae may occur in moist soil or on the surface of moist rocks and wood. Algae live with fungi in lichens. According to the Whittaker scheme, algae are classified in seven divisions, of which five are considered to be in the Protista kingdom and two in the Plantae kingdom. read more

The presumed red algae lie embedded in fossil mats of cyanobacteria, called stromatolites, in 1.6 billion-year-old Indian phosphorite — making them the oldest plant-like fossils ever found by about 400 million years. Red algae are important builders of limestone reefs. read more