Fig. 1
From: European mushroom assemblages are darker in cold climates

The theory of thermal melanism for multicellular mushroom-forming fungi. The theory predicts that dark-colored mushrooms heat up more rapidly than light-colored mushrooms and, therefore, have advantages, such as increased reproductive success, in cold environments. Mushroom photo taken from http://www.peakpx.com/556831/brown-mushroom-coated-with-snow under Creative Commons (CC0). The mushroom illustration was drawn by Franz-S. Krah using the program Affinity Designer