24 
"It is a pretty, shady, medium-sized tree, in the grass laud all round the Soak. 
This grassy plain is of a few hundred acres, dotted over with microtheca to the 
exclusion of almost every other form of arboreal and tall shrubby vegetation ; quite 
park like. Called White Gum here." 
" Tree 4 to 10 metres high, with pendulous branches, smooth white bark, 
subglaucous foliage. Creek near Roeburne, in clayey soil, with Acacias. 
No. 2,758." (L. Diels.) 
Dr. J. B. Cleland (who collected it at Strelley River and other north-west 
localities, where it is known as " Black-heart Gum ") tells me that the trunk of 
this species in Western Australia is often as white as if whitewashed, and the 
whiteness rubs off readily if touched. 
May River and other places, North-west Australia (W. V. Fitzgerald) ; 
Noonkaubak, West Kimberley (E. Mjoberg). 
EXPLANATION OF PLATE 195. 
A. Juvenile leaf, Bourke. 
B. Flowering twig, narrow leaf, from Boolcarrol. 
c. Fruits, from Coolabah, Bogan River. 
D. Broad mature leaf, from Moree District. (All from New South Wales.) 
PHOTOGRAPHIC ILLUSTRATIONS. 
Coolabah (Eucalyptus microtheca). Cooper's Creek, South Australia. 
This is the tree under which Robert O'Hara Burke (of Burke and Wills Exploring Expedition) 
was buried. The initials on the tree, R.O.H.B., and date 21/9/61, were cut by the party who collected 
his remains. 

Coolabah. Bourke District. (Kerry, photo.) 
E. microtheca and Acacia stenophylla (Native Willow or Eumong) lining the banks of Tallaailana 
Creek, 20 miles from Hergott (and 5 miles from Lake Harry Bore). Permanent water, save in specially 
dry times ; desert country for a verv great extent around in all directions. Northern South Australia. 
(W. Gill, photo.) 
