Abstract
Our knowledge of the evolution of vascular tissue through geologic time has come almost entirely from xylem; no doubt due to the fact that thick-walled tracheids are more easily preserved in depositional environments. As a result, secondary xylem is common in the fossil record from the Devonian to the Recent. In contrast, phloem tissue consists of relatively thin-walled cells that are less likely to be preserved. Conducting elements in the phloem are under high hydrostatic pressure while they are functioning and this physiological constraint probably contributes to their collapse during fossilization and their subsequent rarity in the geologic record. Within the past 10 years, however, there have been a number of contributions that have focused on the anatomy of phloem in fossil plants (Table 14.1) and the data from these studies are beginning to provide a picture of phloem structure and evolution through geologic time.
Formerly Edith L. Smoot.
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Dedicated to Katherine Esau for her inspiring work on phloem structure
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Taylor, E.L. (1990). Phloem Evolution: An Appraisal Based on the Fossil Record. In: Behnke, HD., Sjolund, R.D. (eds) Sieve Elements. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-74445-7_14
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DOI: https://doi.org/10.1007/978-3-642-74445-7_14
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