A worldwide community photographing and learning about wildlife
coprinus sp
Coprinus is a small genus of mushrooms consisting of Coprinus comatus (the shaggy mane) and several of its close relatives. (The black ink-like liquid this would create gave these species their common name "ink cap)
Most of this species grows on the ground, surprisingly this particular mushroom emerge from the banana tree....
Certainly not Coprinus and probably not any of the inky cap genera in the family Psathyrellaceae. You will need to post an image of the gills, stem and maybe also do a spore print for anyone to know what it is though.