44 B. H. CAMBAGE. 



Stellate hairs, — Although stellate hairs are present on 

 the juvenile foliage of some species as pointed out by Mr. 

 Maiden, 1 especially among the Corymbosse or Bloodwood 

 group and the Stringybarks, this form of covering is rarely 

 so dense on the Eucalypts as to afford much protection, 

 and is probably one of the early devices. 



Caoutchouc. — The adoption of the caoutchouc coating by 

 Eucalypts appears to be confined to a comparatively few- 

 species, chiefly the Bloodwood group, of which E. corym- 

 bosa may be regarded as typical, and is restricted to the 

 young leaves. It also occurs on the young foliage of E. 

 maculata. It is instructive to note that this feature is to 

 be found chiefly on those Eucalypts whose leaves have the 

 lateral veins arranged almost at right angles to the midrib. 

 The character is also common on the young leaves of 

 Angophora lanceolata and A. intermedia, which have a 

 similar venation, thus sho wing some of the affinities between 

 these two genera to which reference has been made by 

 various writers. The device does not appear to have been 

 adopted as a protection against cold, as it is rare if not quite 

 absent at altitudes exceeding 3,000 feet in latitudes south 

 of 32°, and it probably originated as one of the earliest 

 forms of protection against hot or droughty conditions. 



Glaucescence. — The clothing of the leaves with a glauc- 

 ous powdery wax is often resorted to by the Eucalypts, 

 and especially by the juvenile foliage, but in many instances 

 this method of protection is adopted by the mature foliage 

 as well, and under different conditions of climate, from that 

 of the hot and dry Interior to that of the cool Mountain 

 Region, and also with varying degrees of intensity accord- 

 ing to the age of the leaves. This covering is largely met 

 with in the cool climate, where it may be seen not only on 

 the leaves and buds, but also on the branchlets, and in 



1 Crit. Revision of the Genus Eucalyptus, Part VIII. 



