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Trametes gibbosa
Shelf fungi, my best guess is Lumpy bracket, a polypore mushroom causing a white rot in forest trees. Carpophores are some 10 to 20 cm in diameter, and half-disc in shape. They show a characteristic lump on a place of contact, and concentric light and dark green semi-circles - green ones because of algae. Below, they are very pale green or white-greenish below (Photo N° 4 and 5), with visible pores.
Seen on a fallen birch log, rotting since long on a forest floor and covered by lichen and mosses, and by a couple of Cinnabar polypores. Montane environment, valley in between the Jura Mountain and lake Geneva (Leman); deciduous forest, mainly oak trees, on the French-Swiss border.
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