fungus: an organism of the kingdom Fungi lacking chlorophyll and feeding on organic matter; ranging from unicellular or multicellular organisms to spore-bearing syncytia
organism: a living thing that has (or can develop) the ability to act or function independently
neolentinus ponderosus: a gilled polypore with a large cap (up to 15 inches in diameter) and a broad stalk; edible when young and tender