Do mosses or the plant kingdom includes algae?
Plants, also called green plants, are multicellular eukaryotes of the kingdom Plantae. They form an unranked clade Viridiplantae (Latin for green plants) that includes the flowering plants, conifers and other gymnosperms, ferns, clubmosses, hornworts, liverworts, mosses and the green algae. Green plants exclude the red and brown algae, the fungi, archaea, bacteria and animals.
Algae are protists because they have some of the same organelles. They also are actually called plant like protists. They are still in the protists kingdom though. Protists are microscopic. But, algae is not microscopic. It is confusing but algae is in the Protists Kingdom. Algae also has call walls.
Mosses belong to the division Bryophyta. Bryophytes are generally terrestrial plants but they need water in order to reproduce. As moss is a bryophyte even it is a terrestrial plant which needs abundant moisture for growth and reproduction. So mosses (Bryophytes) are called the amphibians of the Plant Kingdom.
Seaweeds are marine algae: saltwater-dwelling, simple organisms that fall into the somewhat outmoded category of "plants". Most of them are the green, brown or red kinds and most are attached by holdfasts. They use sunlight as do other plants. Seaweeds belong to three kingdoms: Kingdom Plantae ("green" algae seaweeds), Kingdom Plantae ("red" algae seaweeds), Kingdom Chromista ("brown" algae seaweeds) Kingdom Chromista ("yellow-green" algae seaweeds), and Kingdom Bacteria ("blue-green" algae seaweeds).