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| Description: (a) An orange-coloured crustose lichen grows tightly pressed to the substrate. (b) The flattened leaf-shaped genus Umbilicaria is a common foliose lichen. (c) The highly branched genus Cladonia is a common fruticose lichen. (d) A handmade thin slice of Umbilicaria viewed with a compound microscope reveals that the photosynthetic algae occur in a thin upper layer. Fungal hyphae make up the rest of the lichen.
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