Spruce, pine, fir, and additional varieties of trees dominate the chilly expanses of territory that stretch across North America, northern Europe, and Russia, forming a vast circumpolar belt around the globe. These boreal forests represent the most extensive terrestrial ecosystem and are the northernmost forests on the planet.

Nestled within the photosynthetic, or light-eating, tissue of the boreal trees – and within the bountiful cloud-like lichens and feathery mosses that carpet the ground between them – are fungi. These fungi are endophytes, meaning they live within plants, often in a mutually beneficial arrangement.

From SciTechDaily

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