" The work of the radical biologist Lynn Margulis and others has shown humans to be not solitary beings, but what Margulis memorably calls ‘holobionts’ – collaborative compound organisms, ecological units ‘consisting of trillions of bacteria, viruses and fungi that coordinate the task of living together and sharing a common life’, in the philosopher Glenn Albrecht’s phrase. "

― Robert Macfarlane , Underland: A Deep Time Journey