228 TUMOURS OF EUCALYPTS AND ANGOPHORAS, 



List of Species, exempt or liable, as far as known. 



We give a list of the species of which we have seen seedlings, 

 or in two cases, of seedlings which have come under the notice 

 of Mr. Carabage. We offer this list in the hope that biologists 

 in the other States will investigate the condition of the seedlings 

 of Eucalypts accessible to them, which we cannot get, and, 

 especially seedlings of the Mallees; and record their observations. 



Group i., Exempt *S'pecies. — Six species are known to us at 

 present— jE'. oreades from the Blue Mountains, E. pilularis, E. 

 punctata, E. sp., from the foot of the Blue Mountains on the 

 western side; together with E. gigantea Hooker {E. Delegaiensis 

 R. 'V. Baker), and E. fastigata, both from the Federal Capital 

 Territory [collected by Mr. Cambage]. We have obtained seed- 

 lings of the first two in abundance; of the third, a fair number; 

 of the fourth, only one, but it is a fine example. Mr. Cambage 

 has kindly given us four examples of E. gigantea, and twelve of 

 E.fastigata, most of them quite old enough to show that they 

 are free from stem-nodules. 



The seedlings of these six species, as far as we have seen, are 

 exempt from stem-nodules. We prefer to speak of them as 

 exempt, rather than as immune, until their axillary conditions 

 have been investigated, and inoculations carried out. The seed- 

 lings of E. oreades, as well as the two lots of Mr. Cambage's 

 seedlings, up to the stage presented, are just ordinary seedlings, 

 inviting no comment. But seedlings of E. pilularis, E. punctata, 

 and E. sp., as they increase in size, invariably as far as we have 

 seen, gradually come to show a pyriform thickening of the base 

 of the stem (of the wood to some extent, but especially of the 

 bark, as may be seen in transverse sections) over a distance of 

 several inches, according to age. This is not pathological, and 

 seems capable of a simple explanation. The capacity of the 

 root-system of these seedlings for receiving the elaborated sap 

 seems to be unequal to the capacity of the stem for delivering it; 

 so that there appears to be a stagnation of the sap about the 

 base of the stem, such as might be caused by a constriction or a 

 cincture. The enlargement of the stem ends at its junction with 

 the taproot, and does not involve the lateral roots. Transverse 

 cracks appear in the bark, and flakes often come away, when 



