Diatoms as a means for identifying the origin of Aquatic plants
Blumea: Biodiversity, Evolution and Biogeography of Plants , Volume 7 - Issue 3 p. 599- 601
In 1934 Dr van Steenis recorded Elisma natans (L.) Buch. for the first time outside Europe, viz. from Java. This unusual record was based on a single specimen collected in 1932 by Dr A. Kleinhoonte in Central Java at 2000 m altitude on Mt Diëng, now preserved in the Herbarium Bogoriense. Miss Kleinhoonte assumed there was little doubt that she had collected it in Java. After having collected information from the Fisheries Department in Java, that no Elisma was ever planted by that Service, Dr van Steenis stated (1, p. 175): “Though it is a waterplant, I cannot account for this enormous discontinuity.” A year later (2, p. 55) he gave a figure of the specimen and concluded that he felt forced to accept the species as a native of Java. However, he nursed a feeling that there was something wrong in this forced assumption. The pools on Mt Diëng are easy to reach and have been subjected to repeated botanical field work by experienced botanists onwards of Junghuhn. His doubt was later still strengthened by the fact that shortly before the war, the late Mr J. G. T. Loogen, a planter and enthusiastic amateur-botanist living N. of Mt Diëng, repeatedly searched the spot where Elisma was said to be found but without success.
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van der Werff, A. (1954). Diatoms as a means for identifying the origin of Aquatic plants. Blumea: Biodiversity, Evolution and Biogeography of Plants, 7(3), 599–601.