Lichen on gravestone in unpolluted air

Numéro d’image : 11703590
Lichen on gravestone in unpolluted air
Multiple lichen species growing on a gravestone in unpolluted air. Lichens are formed from the a symbiotic association between a fungus and an alga. The alga is contained within the hyphae (filaments) of the fungus. Lichens are slow-growing,and are usually found on stones and the bark of trees. They are sensitive to pollution,and are a good indicator of air quality. Shrubby and leafy lichens,seen here gowing on the top of the gravestone,tend to be more sensitive to atmospheric pollution than crustose species. Photographed at Rhoscolyn,Anglesey,North Wales,UK
Licence : Droits gérés
Crédit: Science Photo Library / Molloy, Cordelia
Taille de l’image : 4827 px × 3620 px
Model Release : Non requis
Property Release : Non requis
Restrictions : -

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