Related Clues:

• Rolling stone's lack
• Tufted plant
• Sign of disuse
• Sphagnum, for one
• Forest undergrowth
• Rootless plant
• Rock growth
• Spore-producing plant
• Peat-bog material
• Velvety growth on stones
• Swamp stuff
• Tree growth
• Non-vascular plant
• Model Kate
• Sphagnum, e.g.