Leohumicola levissima is a species of fungi. It is named after the smooth walled appearance of its terminal conidial cells (levissima is Latin for "smooth"). It was first found in Crater Lake National Park, Oregon. The terminal cell of this species’ conidia remains smooth even after 3 months’ time, as opposed to the encrusted terminal cells of L. verrucosa and L. incrustata. Conidia of ‘’L. atra’’ have similarly smooth terminal cells, but which are darker.