Identify the Symbiosis

The log and fungus are in symbiosis because the fungus benefits and the log is not affected. The fungus is a lichen, because niche's are alleges and funguses. So... yeah... SCIENCE! The fungus get's energy and a habitat from the log, and the log isn't harmed, nor benefited in anyway, so the log is like "AYE, Buddy! I heard you need a place to stay, I got yo back homie!" Then the fungus is like "omg dude, you're so awesome and stuff! Hope you know I need energy from you too." Then the log is totally like "It's all cool brah, I ain't even mad." Then they both end up dead.