The various species that make up the plant kingdom and the animal kingdom are not the only forms of life on our planet. There is another unique category of life: they are the vast and often strange species that make up the kingdom of fungi. Scientists say there are millions of different fungal species - from mushrooms to molds and yeast. Scientists and policymakers have called for more research, saying we ignore these vital life forms at our peril. Faith Lapidus reports.