Related Clues:

• Lyricist Hart
• Peat-bog material
• Velvety growth on stones
• Swamp stuff
• Tree growth
• Non-vascular plant
• Model Kate
• Sphagnum, e.g.
• Tree hugger?
• Cushiony forest seat
• Prince Edward Island crop, Irish _____
• Non-flowering plant
• Rolling stones' lack
• Rock coat
• Bryologist's interest