Yeager, Chris M, Kornosky, Jennifer L, Morgan, Rachael E, Cain, Elizabeth C, Garcia-Pichel, Ferran, Housman, David C, Belnap, Jayne, and Kuske, Cheryl R, Three distinct clades of cultured heterocystous cyanobacteria constitute the dominant N2-fixing members of biological soil crusts of the Colorado Plateau, USA.: .