Backlit Orange Pinwheel Marasmius cap showing gills (Marasmius siccus). Gills are well-separated/distant, proportionately more so than virtually any other of the gilled mushrooms. Cap is approximately 2 cms in diamter. Though gills are actually white to the eye, the back lighting imparts the reddish brown color of the cap flesh.
Copyright ©Mark Steinmetz