large mushroom in the nook of a tree

arboriculture arboriculturist arboriculturists arborist arborists bark bottomed bracket brackets branch branches brown conk conks decay decayed decaying disease diseased ecologist ecologists ecology flat forest forests fungal fungi fungus garden gardener gardeners gardening gardens green harm harmful health healthy heartwood horticulturalist horticulturalists horticulture horticulturist horticulturists host ill infect infected infection large moss mossy mushroom mushrooms perennial polypore rot rots rotted rotten rotting science shade shady shelf sick spore spores threaten tongue tree trees trunk trunks unhealthy white wood wooden woods