What kingdoms are blue-green, green & red algae?

[swampwiz]

AIUI, there are these 3 types of algae, with blue-green algae being technically bacteria, green algae being plants, but what are red algae?

 

[Bystander]

https://en.wikipedia.org/wiki/Red_algae

 

[Drakkith]

https://en.wikipedia.org/wiki/Red_algae

Hmmm. It looks like there's some problems with its classification:

Below are other published taxonomies of the red algae using molecular and traditional alpha taxonomic data; however, the taxonomy of the red algae is still in a state of flux (with classification above the level of order having received little scientific attention for most of the 20th century).[28]

• If one defines the kingdom Plantae to mean the Archaeplastida, the red algae will be part of that kingdom
• If Plantae are defined more narrowly, to be the Viridiplantae, then the red algae might be considered their own kingdom, or part of the kingdom Protista.

 

[swampwiz]

Hmmm. It looks like there's some problems with its classification:

According to this, there is no Protista anymore; possibly it is now Protozoa or Chromista?

https://en.wikipedia.org/wiki/Kingdom_(biology)

 

[Bystander]

some problems with its classification:

Linnaean versus cladistic.