DescriptionCoastal vegetation zones at St Malo.jpg
English: Coastal vegetation zones at St Malo. At top, grassland with gorse bushes; then bare rock with lichen, first the pale orange Caloplaca marina, then (in the upper littoral zone) the black Hydropunctaria (Verrucaria) maura. Below that a zone of green algae, and finally dark "brown" algae.
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Zones de végétation côtière à Saint-Malo. En haut, une prairie avec des buissons d'ajoncs ; puis des roches nues avec des lichens, d'abord le Caloplaca marina orange pâle, puis (dans la zone littorale supérieure) Hydropunctaria maura.