Vessels in Roots of Marsilea

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Science  07 Apr 1961:
Vol. 133, Issue 3458, pp. 1073-1074
DOI: 10.1126/science.133.3458.1073


The occurrence of vessel members in the roots and the possible occurrence of sieve-tube members in the rhizome is reported for the first time in the heterosporous fern Marsilea quadrifolia. This discovery adds a new instance of parallel evolution of vessels in vascular plants.