Schizophyllum commune Fr.
(Splitgill, Common Porecrust)

A formerly rare bracket fungus that has become quite common in the south in recent decades. Usually growing on fallen wood it also forms characteristic clumps bursting through the plastic wrapping of "big bale" hay. As the name implies it is unusual in having paired gills which lie face-to-face when wet but roll up and separate as they dry. Only the outside surface bears spores and this is protected when rolled up.