I broke off one of the split gill mushrooms so that I could photograph the underside, which is especially pretty, very shell-like. To my surprise I found a cluster of tiny cocoons, every one of which was empty. If you look closely you can see that the top has been neatly cut and the 'lid' pushed back to allow the insect to emerge. Many insects are associated with fungi, so I am not sure what may have been in here, but judging from the cocoons, possibly something in the Hymenoptera family. The mushroom is very small, perhaps 1/2 inch across, so you can see how tiny the cocoons are.