Abstract
1. The course of the leaf traces in Potamogeton is not typically monocotyledonous, for in the more robust species the three traces run down through one internode at the periphery of the central cylinder before entering the medulla, where they descend through a second internode, finally fusing with cauline strands. 2. At the points of fusion the bundles are found to be amphivasal, while they are collateral throughout their internodal course. 3. The phloem of the bundles at the base of a branch shows a marked swelling. 4. The cortical bundles present in some species of Potamogeton are not regarded as a primitive feature, since they do not occur in the fertile part of the floral axis and occur only sparingly if at all in the creeping stem. They enter the stem as small strands from the stipules and petioles and are not as a rule connected with the principal leaf traces. In Zostera and Cymodocea, however, there is a system of cortical bundles which are connected with all of the principal leaf traces except the...
Submitted Version (
Free)
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call