Yellow wallflower / Erysimum asperum in black cryptobiotic soil crust, Utah, USA.
A yellow wallflower (Erysimum asperum) plant grows in black cryptobiotic soil crust in Natural Bridges National Monument, near Blanding, Utah, USA. Because the Monument has been closed to grazing for nearly a century, and off-road motorized travel is restricted, Natural Bridges contains extensive areas of undisturbed, mature cryptobiotic soils. This knobby, black crust is dominated by cyanobacteria, but also includes lichens, mosses, green algae, microfungi, and bacteria. Also known as biological soil crust, this living groundcover forms the foundation of high desert plant life throughout canyon country.Add to Cart Add to Lightbox Download