208 TUMOURS OF EUCALYPTS AND ANGOPHORAS, 



Plate xi. shows a series of seedlings of two of the Bloodwoods 

 {E. corymhosa and E. eximia) which differ from any other seed- 

 lings of Eucalypts that we have seen, in that they have, usually, 

 only one pair of effective, axillary nodules, though there are 

 sometimes two, and occasionally more in late stages; but they 

 almost always have an unpaired, not definitely located nodule 

 below the level of the cotyledons. Figs. 1 and 2 represent two 

 young seedlings, somewhat older than the two shown in Plate iv. 

 One of them has only one axillar}^ nodule; we have other seed- 

 lings like it. Both are too young to show the unpaired nodule. 

 When it does appear, it is sometimes much closer to the axillary 

 nodules than at others. Occasionally, it is far enough away to 

 indicate that it possibly developed on the taproot, rather than 

 on the hypocotyl. It seems to be probably a case of wound- 

 infection due to a possible tendency of the bark of these young 

 seedlings to crack in growing. The nodule extends upwards, 

 fusing harmoniously with the fused, axillary stem nodules; and 

 grows downwards also, partially, or by degrees, entirely encircling 

 the axis. The fusion usually ends abruptly. It may be an inch 

 long, or four inches, and in one case about eight inches. In late 

 stages, it increases in diameter, but continues to be cylindrical 

 in shape. One specimen has two unpaired nodules, one below 

 the other. The lower one is evidently a root-development. 



The presence of more than one pair of axillary nodules is 

 unusual in E. corymhosa. But we have one advanced seedling 

 which has five pairs [first pair (one with a shoot) fused, and the 

 fused pair fused with the unpaired nodule, as usual; one nodule 

 of the second pair with a shoot, and fused with the concrescence, 

 its fellow very small, and solitary; the nodules of the third, 

 fourth, and fifth pairs small, unequally developed, and not fused]. 



One seedling of E. eximia (Plate xi.. No. 6) has two pairs of 

 axillary nodules, which is unusual, (though we have another like 

 it) and a pair of root-nodules; but, apparentl}', the unpaired 

 nodule is absent in this case, unless it is represented by one of 

 the root-nodules. Both root-nodules have incorporated a root, 

 but that of the smaller one was accidentally broken ofi' short, 

 and its stump is hidden from view. 



