Related Clues:

• Bryophyte
• Plankton part
• Aquarium organism
• Spore-producing plant
• Microscopic pond organism
• Bit of marine life
• Peat-bog material
• Velvety growth on stones
• Pond problem
• Swamp stuff
• Tree growth
• Non-vascular plant
• Bit of scum
• Model Kate
• Sphagnum, e.g.