I think if we could communicate with fungus we might find that we didn't have a lot in common. The fungus is probably way more concerned with rodents taking a shit in a hole somewhere than we are. It would probably never shut up about it. Considering who you ask there is some seagrass that is the largest and oldest organism. https://www.newscientist.com/article/dn21433-patch-of-seagrass-is-worlds-oldest-living-organism/