Terry M., Mauseth J. D., Root-shoot anatomy and post-harvest vegetative clonal development in Lophophora williamsii (Cactaceae: Cacteae): implications for conservation, SIDA, Contributions to Botany, 2006, 22(1):565-592
The histological analysis of five plants of different sizes distinguishes features of the underground stem and root of Lophophora williamsii. The authors describe cortical bundles, pith, root conducting tissues and observations of regeneration and clonal branching after loss of the apex.