For those interested in Lichens or biology, this article is very interesting. It seems Lichens have a third component in the symbiosis that has been hiding in plain view without anyone realising for 150 years.  Who says three is a crowd?

 (Just let the initial subscription advert run itself out).

http://www.theatlantic.com/science/archive/2016/07/how-a-guy-from-a-montana-trailer-park-upturned-150-years-of-biology/491702/