BY R. H. CAMBAGE. 569 



about the most western point reached by this species. It is 

 easily distinguished, in the forest, from other box-trees, 

 such as E. alberis, hy its fine, erect boles, which, together 

 with its branches, are covered with grey box-bark. Its 

 juvenile foliage and "suckers" are characteristic, bfeing 

 rather long, cordate and opposite, on quadrangiilar stems. 



K. maculosa, a rather small-fruited, white gum, was 

 noticed towards the edge of the Permo-Carboniferous forma- 

 tion, east of the Square Rock, or Little Rick, which marks 

 a point on the eastern margin of its habitat. It is first met 

 with, on the Western Railway Line, at a few hundred yards 

 beyond the Wentworth Falls Station. On the western side 

 of the Mountain Area, it is a fairly common tree from 

 Rylstone southwards, but rarely comes below an altitude of 

 2,000 feet on the coastal side, or about 1,500 feet on the 

 western side. 



E. acervula occurs around Byrnes' Gap, and towards Co- 

 long, and is known as Swamp-Gum. It is a common gum- 

 tree in Tasmania, where it is usually called Red Gum. It 

 comes north through Victoria and sovithern New South 

 Wales, keeping in the Mountain Area in this State, and 

 usually selecting the damp valleys for its home, hence Mr. 

 Baker's name, E . j^C'^udosa. It shares with E . 2nl'ilaris the 

 characteristic of having large, lateral roots, which protrude 

 above the surface of the ground. These two species do not 

 grow together, however, E. acervula keeping on the higher 

 country. The locality around Byrnes' Gap, and Butcher's 

 Creek, just north of Yerranderie, is the most definite northern 

 spot known to me for the species. In its selection of soils, 

 the Swamp Gum appears to avoid that which is extremely 

 siliceous ; and it is, perhaps, owing to this fact, that its 

 northern limit is restricted to the locality just mentioned. 

 Yerranderie is about the southern margin (west of the Wol- 

 londilly) of the Hawkesbury Sandstone, an extremely silice- 

 ous rock, and it would seem that the Swamp-Gum finds this 

 formation too acid ; for it is significant that, although it con- 



