Stinkhorns are about as unusual as fungi get, and that is more than unusual enough for me. They are North American natives.
Identification: Whoever coined the name “stinkhorn” wasn’t kidding—these can clear out a room. They smell like rotting meat, attracting flies which pick up and distribute some of the spores. Flowers, of course, use a similar strategy to achieve pollination (thankfully relying mostly on scents that are attractive to people), but very few fungi are able to do this. Mature fruiting bodies are 1½-6" (4-15 cm) in height. The caps of stinkhorns are black to olive-brown, oval in shape, slimy, pitted (like morels), with a white ring at the top. The overall effect is phallic. A netlike veil or skirt emerges from under the cap. The veil may appear attached directly to the stalk, or hang loosely around it. Here is a time lapse movie of the mushroom’s fruiting cycle.
Dictyophora duplicata on Tom Volk's Fungi site, at the Department of Biology at the University of Wisconsin
Dictyophora duplicata on Michael Kuo's MushroomExpert.com
Dictyophora duplicata on RogersMushrooms.com
Dictyophora duplicata at the Connecticut-Westchester Mycological Association
Dictyophora duplicata at the Cornell University College of Agriculture and Life Sciences Department of Plant Pathology (a time lapse movie)
Dictyophora duplicata on AmericanMushrooms.com
Dictyophora duplicata description by Thomas H. Kent, last updated 16 Aug 2013.