Fungi loving the damp

Nice day in the garden , lawn given a quick high cut.

This is Trametes versicolor I believe or stereum ostrea, the false turkey tail fungus.   Both have the fan-shaped fruiting body which has bands on it that remind one of the tail of a turkey. The easiest way to distinguish between the two is that Trametes has pores on the underside of the shelf-like fruiting body, while Stereum has no pores, just a brown smooth spore-bearing surface. Both fungi are wood decayers, and both cause a white rot. The green colour you see on the fruiting bodies is caused by an epiphytic green alga. It is actually difficult to find a Stereum ostrea fruiting body without the algae on it. The alga has a commensal relationship with the fungus, deriving no nutrients from it, but instead using the fungus to gain a better position in the environment, in this case for better photosynthesis. There is no physiological interaction between these commensal organisms.