Free images results:
 

Roots pictures, stock photos and images

 
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Tree Trunks Stock Images
Author: Lydia
Old tree Royalty Free Stock Photography
Author: Razvanjp
Hyacinth Royalty Free Stock Photos
Author: Rbouwman
 
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Also, here are some commercial RF-licensed images that match your search criteria:  
Tree roots Stock Photos
Author: Sherez
Tree roots Royalty Free Stock Photo
Author: Julkab
Roots Stock Image
Author: Mikeexpert