Lophophora pollen grain images thanks to Gerhard Koehres
Molly T. Klein, M. Kalam, Keeper Trout, Norma Fowler & Martin Terry. 2015. Mescaline concentrations in three principal tissues of Lophophora williamsii (Cactaceae): Implications for sustainable harvesting practices. Haseltonia 20: 34–42. [~4 Mb PDF][PDF of the problems that we noticed in our hardcopy.]
Bia Labate (producer). 2016. Youtube video featuring Martin Terry demonstrating the proper technique for sustainably harvesting Lophophora williamsii that is intended for sacramental use.
Keeper Trout & Martin Terry. 2016. Decline of the Genus Lophophora in Texas. page 1-20 (Chapter 1) in Peyote: History, Tradition, Politics, and Conservation, Beatriz Caiuby Labate and Clancy Cavnar, Editors, Praeger (ABC-CLIO) ISBN 978-1-4408-3400-4.
A surprising number of errors were introduced into this work after both the authors and the editors had performed final proofing.
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Cactus Conservation Institute