Fungus humongous! New research on fungi demonstrates how small changes in environmental factors can lead to huge changes in the organism's evolution. NYU biologists Enrique Rojas and Maxim Ohairwe and colleagues discovered a “tipping point” in the evolution of fungi that throttles their growth and sculpts their shapes. Although fungi—nature's great composters—often bring to mind mushroom caps, fungi also have underground “roots” called mycelia. Mycelia are made up of thousands of interconnected,