aaw_020 December 20, 2018February 5, 2019 Matthew Caulkins, Web Applications Program Manager Previous Next M-25. Picea glauca albertiana conica. Mrs. Bayard Thayer’s Estate, Lancaster, Massachusetts. Photograph by E.H. Wilson, December 15, 1923. All photographs by Ernest Henry Wilson. Copyright © President and Fellows of Harvard College, Arnold Arboretum Archives; all rights reserved.