The root zone is humus and filled with decaying matter which make it very rich media. I've had friends go on expeditions to the rainforests of several places to tour, document and, if properly licensed, collect specimens. The photos they show from the floor are largely huge trunks of tall trees, epiphytes hanging off everything, tons of ferns and vines, lots of different fungi, and many hemiepiphytes. Every thing is constantly wet, not from rain, but from extreme humidity.
