The final preparation of this manuscript was completed with the generous assistance of many individuals. The following people read all or portions of the manuscript. Their keen insights and suggestions have enhanced the text significantly: C. L. Calvin, B. W. Geils, R. H. Hamre, J. G. Laut, E. J. King, R. L. Mathiasen, D. L. Nickrent, C. G. Shaw III, R. F. Scharpf, and R. O. Tinnin.
Following Frank Hawksworths death, Charles (Terry) Shaw provided broad and generous support for all phases of the project. The assistance of Brian Geils was critical for completion of numerous technical details, especially editing tables, figures, and appendices. Bob Hamres deft editorial pen benefitted the text enormously. Sheila Ames rose to the challenge of an enormous bibliographical task, and Bonnie Speir withstood requests for continual revisions with remarkably good cheer. Mai Dailey assisted with correspondence and indexing. Joyce Patterson, Bernadette Velick, and Tracy Wager, provided the skillful illustrations that occur throughout the text. John Sprackling made especially significant contributions by assisting with herbarium work, phenological analyses, and preparation of the distribution maps.
We thank the curators of the many herbaria in North America, Central America, Europe, Asia, and Africa who allowed us to examine dwarf mistletoe collections. Also, we acknowledge the assistance of the many colleagues who collected specimens, provided data, reviewed various aspects of the manuscript, supplied photographs or drawings, assisted with numerical analyses and laboratory work, and performed many other courtesies.
The more than 60 colleagues who provided information during the preparation of the 1972 monograph are listed in that work. Many of those associates and numerous others also aided us in the preparation of this revision. In addition, we are grateful to the following individuals for their assistance in various aspects of the study—
Robert P. Adams, Salt Lake City, UT
James Arthur, Washington State Department of Natural Resources, Olympia, WA
Fred Baker, Utah State University, Logan, UT
D. K. Bailey, Boulder, CO
Dale R. Bergdahl, University of Vermont, Burlington, VT
Jerome S. Beatty, USDA Forest Service, Portland, OR
Ignacio Carbajal V., Forestal Sanidad, Mexico City, Mexico
Robert Celaya, Forestry Department, Arizona Land Board, Phoenix, AZ
Miguel Caballero Deloya, Forestry Research Institute, Mexico City, Mexico
Miguel Cházaro Basanez, Universidad de Guadalajara, Mexico
David Cibrián Tovar, Universidad Autonoma Chapingo, Mexico
Jose Cibrián Tovar, Forestal Sanidad, Mexico City, Mexico
Daniel J. Crawford, Ohio State University, Columbus, OH
James Davis, New Mexico State Forest Service, Santa Fe, NM
Robert Davis, USDI Bureau of Land Management, St. George, UT
Gregg DeNitto, USDA Forest Service, Redding, CA
Edwin Donabauer, Institut für Forstschutz, Vienna, Austria
Oscar J. Dooling, USDA Forest Service (deceased)
Reggie Fletcher, USDA Forest Service, Albuquerque, NM
Michael Frankis, Newcastle Upon Tyne, England
Robert L. Gilbertson, University of Arizona, Tucson, AZ
Sherel Goodrich, USDA Forest Service, Vernal, UT
Jan Henderson, USDA Forest Service, Olympia, WA
Paul Hennon, USDA Forest Service, Juneau, AK
Reynaldo Hernandez Martínez, Forestal Sanidad, Durango, Mexico
Thomas E. Hinds, USDA Forest Service (retired)
Yasu Hiratsuka, Forestry Canada, Edmonton, Alberta, Canada
James T. Hoffman, USDA Forest Service, Boise, ID
David W. Johnson, USDA Forest Service, Denver, CO
Kiu Hua-shing, South China Institute of Botany, Guangzhou, China
Donald M. Knutson, USDA Forest Service (retired)
Richard G. Krebill, USDA Forest Service, Ogden, UT
David Leatherman, Colorado State Forest Service, Fort Collins, CO
Paul C. Lightle, USDA Forest Service (retired)
Yan B. Linhart, University of Colorado, Boulder, CO
Jorge Macias Samano, Forestal Sanidad, Mexico City, Mexico
Xavier Madrigal Sanchez, Universidad de Morelia, Michoacán, Mexico
Helen M. Maffei, USDA Forest Service, Bend, OR
Les Magasi, Forestry Canada, Frederickton, New Brunswick, Canada
Walter R. Mark, California Polytechnic State University, San Luis Obispo, CA
Sandra Martin, USDA Forest Service, Pullman, WA
Rolf W. Mathewes, Simon Fraser University, Burnaby, BC, Canada
Laura M. Merrill, USDA Forest Service (retired)
John A. Muir, Ministry of Forestry, Victoria, BC, Canada
Fernando Najera Martínez, Forestal Sanidad, Santiago Papasquiaro, Mexico
Thomas H. Nicholls, USDA Forest Service, St. Paul, MN
Juan Antonio Oliva, Forestal Sanidad, Chihuahua, Chihuahua, Mexico
Michael E. Ostry, USDA Forest Service (retired)
Marie-Francois Passini, Université de Marie et Pierre Curie, Paris, France
A. Michael Powell, Sul Ross State University, Alpine, TX
Nick Reid, University of New England, Armidale, NSW, Australia
Lewis F. Roth, Oregon State University (retired)
Keith D. Rushforth, Fareham, Great Britain
Kenelm Russell, Washington State Department of Natural Resources, Olympia, WA
Jerzy Rzedowski, Institute de Ecologia, Patzcuaro, Michoacán, Mexico
Rudolfo Salinas Quinard, Investigaciones Forestales, Mexico City, Mexico
Michael E. Schomaker, Colorado State Forest Service, Fort Collins, CO
C. Gardner Shaw, Washington State University, Pullman, WA (retired)
Pritam Singh, Forestry Canada, Ottawa, Ontario, Canada
Michael Slivitsky, Department of Parks and Forestry, Manitoba, Canada
Richard B. Smith, Forestry Canada, Victoria, BC, Canada (retired)
Richard S. Smith, Jr., USDA Forest Service (retired)
Bruce A. Sorrie, Division of Fisheries and Wildlife, Boston, MA
Robert B. Taggart, Colorado State University, Fort Collins, CO
Walter Thies, USDA Forest Service, Corvallis, OR
Allan van Sickle, Forestry Canada, Victoria, BC, Canada
Ignacio Vazquez Collazo, CEFAP-Uruapan, Uruapan, Michoacán, Mexico
Roberto Velasco, Sanidad Forestal, Chihuahua, Chihuahua, Mexico
Detlev Vogler, University of California, Berkeley, CA
Ed Wass, Forestry Canada, Victoria, BC, Canada
Melvyn J. Weiss, USDA Forest Service, Washington, DC
Ed F. Wicker, USDA Forest Service (retired)
Zakaullah, Pakistan Forest Institute, Peshawar, Pakistan
Thomas A. Zanoni, Jardin Botánico Nacional, Dominican Republic