Abstract
Fortnightly collections of bark samples of 3 consecutive calendar years revealed that the main bulk of secondary phloem formation inDelonix regia takes place late in a calendar year during October and November. About 30 to 40 layers of phloem cells measuring about 400 to 500 μm in depth, are produced during this period. A narrow strip of 4 to 5 layers of new phloem cells (precursor type) also differentiates in late April from the over wintered phloem mother cells. The October-November phloem functions for about 10 to 11 months and the precursor type for about 8 months.
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