(c) Toadstool growing in bare dunes, Foto Fitis, www.fotofitis.nl The dune stinkhorn is probably best known for its strange phallus-shaped appearance and its strange odor. It grows on old marram grass roots. Evn though it's found jst about along the entire Dutch coast, it is a rare species and listed as vulnerable on the Red List. The odor may be very unpleasant for people, it attracts loads of flies which spread the spores. This mushroom has a thick, spongy hood and a fragile, hollow stem.