Schizophyllum commune

Possibly the most dangerous thing you could come in contact with in the wild... " they have been linked to such adverse health effects as brain abscess, fungus ball in the lungs, sinusitis, allergic bronchopulmonary mycosis, ulcerative lesions of the hard palate, chronic lung disease, meningitis, and onychomycosis. In one case, the fungus had grown through the soft palate of a child's mouth and was actually forming mushrooms in her sinuses... " (thanks Blueswami.com) Also known as 'Split gills' these fungi are possibly the most widespread species on earth, being found on every continent except Antarctica. Be careful with these although the aren't poisonous.