Noun sphagnum has 1 sense

1. sphagnum, sphagnum moss, peat moss, bog moss - any of various pale or ashy mosses of the genus Sphagnum whose decomposed remains form peat
   --₁ is a kind of moss
   --₁ is a member of genus Sphagnum
   

1. A type of moss belonging to the family Sphagnaceae, commonly found in wetlands or peat bogs. Sphagnum moss is known for its ability to retain water and is often used in gardening and floral arrangements.

Example sentence: The hiker's boots sunk into the damp sphagnum covering the forest floor.