Any of many aquatic photosynthetic organisms, including the seaweeds, whose size ranges from a single cell to giant kelps and whose biochemistry and forms are very diverse, some being eukaryotic.
Any alga, lichen, bryophyte, or other plant of seemingly simple structure.
Any of various small, green, seedless plants growing on the ground or on the surfaces of trees, stones, etc.; now specifically, a plant of the phylum Bryophyta (formerly division Musci).
A bog; a fen.
A kind or species of such plants.
To become covered with moss.
To cover (something) with moss.