Elmer and his wife, Emma Osterman Elmer, had once planned to leave American-controlled Manila and return to their homeland shortly before the Japanese attack on Pearl Harbor occurred.[8]
The Japanese invasion succeeded it in no time and involved the couple, as well.
Adolph Elmer died on either April 17, 1942[1][4] or in July 1942, in the Santo Tomas Internment Camp in the Manila, Philippines,[3] of natural causes.[5] His private type collection, held in the Philippine National Herbarium, was destroyed about that time. Emma Osterman Elmer survived internment.[8]
^His name also appears in a list of plant collectors of the Kew Herbarium specimens published in 1901, as one who conducted activity in Washington Territory.[6]
^ ab"Arlington News". The Enterprise. Vol. 48, no. 2. January 13, 1944. p. 7. Retrieved May 19, 2021. Word was received indirectly through other relatives, that Mrs. Emma Osterman Elmer, at one time a resident of Arlington, is alive and seemingly well in the Philippines. It has been over a year since last hearing from her, and it was feared she was dead. Mrs. Elmer and her husband, a professor in the University of the Philippines for many years, planning to return shortly before Pearl Harbor. Later, Professor Elmer died in a concentration camp, and since that, no word had been received. Mrs. Elmer wrote that she was living in an apartment, but was under close watch at all times, she had good food and kind treatment.
Sayre, G. (1975). "Cryptogamae Exsiccatae: an annotated bibliography of exsiccatae of algae, lichens, hepaticae, and musci. V. Unpublished Exsiccatae: I. Collectors". Memoirs of the New York Botanical Garden. 19 (3): 317.