Pseudohydnum is a genus of fungi that mycologists haven't yet ascribed to a family, so these fungi are orphans, at least in terms of Linnaean classification. Most species within the genus are white, and one of the best known is pseudohydnum gelatinosum - the Toothed Jelly Fungus. This is a strange wood-growing fungus that grows in a spiked tooth or hedgehog shape.