The closest living relatives to plants are:

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Stoneworts (Charophytes) are a group of green algae that are the closest living relatives to land plants. They share many morphological and genetic features with land plants, including the presence of cell walls made of cellulose, the ability to synthesize similar pigments, and the use of the same type of DNA polymerase. Red algae (Rhodophytes) are also photosynthetic organisms but are not as closely related to land plants as stoneworts. Ciliates, amoebas, and foraminifers are all eukaryotic organisms but are not related to plants.

The Closest Living Relatives to Plants Are