| Rhizophora mangle. | |
|---|---|
| Growth of fruit in height. | |
| Lines or tenths of an inch (millimetres in brackets). | Number of days since fertilisation. |
| 2 (5) | 30 |
| 3 (7·5) | 42 |
| 4 (10) | 50 |
| 5 (12·5) | 61 |
| 6 (15) | 67 |
| 7 (17·5) | 74 |
| 8 (20) | 83 |
| 9 (22·5) | 92 |
| 10 (25) | 100 |
| 11 (28) | 105 |
| 107 { Protrusion of the hypocotyl | |
| Growth of the protruding hypocotyl. | |
| 10 (25) | 127 |
| 20 (50·5) | 141 |
| 30 (76) | 151 |
| 40 (101·5) | 160 |
| 50 (127) | 167 |
| 60 (152) | 175 |
| 70 (177·5) | 185 |
| 80 (203) | 202 |
| 90 (228) | 222 |
| 229 { Fall of the seedling | |
Explanation of the Table.
We have here shown the period between fertilisation and the fall of the seedling from the tree.
This period divides itself into two parts, the first being concerned with the continuous growth of the fruit and of the inclosed embryo until the tip of the hypocotyl appears through the apex of the fruit, the second being indicated by the growth of the protruding hypocotyl until the fall of the seedling.
The height of the fruit is measured from the base of the calyx-lobes, and the length of the hypocotyl at first from the apex of the fruit and afterwards from the edge of the protruding neck of the cotyledonary body. The height of the ovary at the time of fertilisation is about 3 millimetres; and from that time onward it is to be regarded as a fruit.
[To face page [452].
FIGURES ILLUSTRATING THE DEVELOPMENT OF
THE SEED AND THE GERMINATING PROCESS
OF RHIZOPHORA AND BRUGUIERA