Related Clues:

• Forest sticker
• FBI pt.
• Prickle
• Prickly plant part
• Prickly seed cover
• Thing that may stick in a fur coat
• Prickly seed casing
• Prickly casing
• Sticker in your sock
• Prickly chestnut case
• Clinger to a hiker's sock
• Chestnut coating
• Rough case?
• Seedcase that inspired Velcro
• Sticky seedcase