Pseudotulostoma volvata: This very strange fungus was described in a study by Dr. O.K. Miller and colleagues Dr’s Henkle, and James from Duke University. and Dr. Steve Miller from the University of Wyoming.  It grows under Dicymbe forest in a remote area of Guyana where Dr. Henkle, now from Humboldt State University, has a research project.

Also see: A Strange New Fungus Among Us! (.pdf)
by Orson K. Miller, Jr.