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In this case the formation of the primary bundle passes straight over into the formation of secondary tissue by a cumbium, and no line can be drawn between the two processes.
This type is found in nearly all Pteridophytes and, so far as is known, in Cycadofihices, both in primary and secondary tissue.
In stems with open bundles the formation of cambium and secondary tissue may be confined to these, when it is sard to be entirely fascicular.
In that case either very little secondary tissue is formed, as in the gourds, some Ranunculaceae, &c., or a considerable amount may be produced (clematis, barberry, ivy).
In other cases a most intricate arrangement of secondary tissue masses is produced, quite impossible to interpret unless all stages of their development have been followed.
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