I don't know if this old bench qualifies as a lichen eco-friendly system or not. I've been waiting for a friend with a truck to help me haul it to the dump. However, while waiting, lichens have made it their home - on the old wooden slats and even the rusty iron. There are at least three lichens I can spot here. Can you pick them out? BTW, will post my last shot in my little lichen series tomorrow.