The Green Man
The most common and perhaps obvious interpretation of the Green Man is that of a pagan nature spirit, a symbol of man’s reliance on and union with nature, a symbol of the underlying life-force, and of the renewed cycle of growth each spring. In this respect, it seems likely that he has evolved from older nature deities such as the Celtic Cernunnos and the Greek Pan and Dionysus.
Some have gone so far as to make the argument that the Green Man represents a male counterpart - or son or lover or guardian - to Gaia (or the Earth Mother, or Great Goddess), a figure which has appeared throughout history in almost all cultures. In the 16th Century Cathedral at St-Bertrand de Comminges in southern France, there is even an example of a representation of a winged Earth Mother apparently giving birth to a smiling Green Man.
www.greenmanenigma.com/theories.html