Stinkhorns
Central Park, New York City, 2006-09-26
I think these are Net Stinkhorns (Dictyophora duplicata, but they could perhaps be Eastern Stinkhorns (Phallus ravenelii) instead. It’s also possible the ones at the top and in the middle of the picture are Net and the ones at the bottom are Eastern. I didn’t have my mushroom guide with me when we spotted these.
Update: the ones at the bottom are definitely Eastern Stinkhorns. I’m still not sure about the ones at the top.