lichen growing the face sandstone rock wall lichens are keystone species

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Lichen growing on the face of a sandstone rock wall. Lichens are a keystone species Royalty Free Stock Photo
Lichen growing on the face of a sandstone rock wall. Lichens are a keystone species Royalty Free Stock Photo
   
   
   
   
   
Lichen growing on the face of a sandstone rock wall. Lichens are a keystone species
   
   
   
   
   
   
   
Lichen growing on the face of a sandstone rock wall. Lichens are a keystone species in many ecosystems

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