398 E. C. ANDREWS. 
tinent, especially in the moist cool portions. A few outliers 
occur in the sub-arid areas of Hastern Australia. 
During the gradual elevation of Hastern Australia in 
Tertiary time this hardy group of moisture-loving Acacias 
appears to have been developed in the south-eastern portion 
of the continent, which at this period extended both to 
Tasmania and beyond it tothe south. The phyllodes were 
fairly broad, except in the cases of types suchas A. linifolia 
and A. suaveolens, whose development took place in barren 
sandy soils. 
With the formation of the plateaus of Hastern Australia 
at the close of the Tertiary, and at a period still later, 
namely, the Glacial Period, these types underwent great 
modifications and many of them journeyed north beyond 
Sydney and Brisbane. Among the younger types may be 
mentioned those species possessing large luxuriant phyllodes 
such as A. falcata and A. penninervis. Some, such as A. 
decora, adapted themselves to the sub-arid and stony 
wastes of the inland areas, while forms such as A. salicina 
and A. myrtifolia appear to have crept across to Western 
Australia, by way of sandy areas in the moister portions 
of Southern Australia. A variety of A. salicina, known 
as the Cooba, flourishes in the deep alluvium along the 
watercourses and appears to be a remarkable adaptation 
ofa type which has evidently sprung from a species flourish- 
ing in barren sandy soil, and it is exceedingly interesting 
in this connection to know that a dwarfed and straggling 
form identified as A. salicina by Mr.J.H. Maiden, flourishes 
on the bare sandy ridges of the Cobar district. It is 
possible that this type is the ancestor of that which follows 
the watercourses. It may be interesting in this connection 
to note that Hucalyptus rostrata creeps along the water- 
courses, while a form, with similar fruits, but of dwarfed 
and straggling habit, EH. Bancrofti, flourishes on the poor 
sandy soils. 
