Melanohalea exasperata, a green foliose lichen in the family Parmeliaceae, growing on the trunk of maple tree in Finland

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Photo credit: © Henri Koskinen / Alamy / Afripics
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Keywords: ascomycota, aspera, christiansenii, december, exasperata, finland, foliose, fungi, fungus, green, hobsonia, illosporiopsis, lichen, lichens, melanelia, melanohalea, mushroom, parasite, parasitic, parmelia, parmeliaceae, physcia, pink, red, tree, trunk