144 J. H. Maiden. 
possible to distinguish the two species. The juvenile leaves, buds and 
fruits, however, sharply separate them. 
10. Eucalyptus Dunnii Maiden, l. c., p. 336. 
A large White Gum, much resembling the Blue Gum (E. saligna) 
when growing (W. Dunn), therefore an erect grower. My specimens 
were taken from a tree 3 feet in diameter and 70 feet high (measured 
felled). Bark. — Rough, flaky or more or less corky at the butt and 
for a varying distance up the stem; thenceforward the bark hangs in 
ribbons. „The rough bark or ribbons follow the tree up to the topmost 
branches, and the tree always carries more of it than does E. saligna“ 
(W. Dunn). Timber. — White throughout, from the sap to the heart, 
somewhat coarse-grained and fissile. Apparently a tough wood. Stress 
is laid on the quality of this timber, as the name White Gam usually 
indicates timber of poor quality. Mr. Dunn writes: „I prefer this timber 
to that of our local Blue Gum (E. saligna), the White Gum being not so 
free, i. e., not so liable to split. It is the best White Gum I have ever 
seen, being very free from gum veins.“ On asking for verification of 
the above high estimate of the timber, Mr. Dunn wrote under date 4 th. 
June: „Yesterday I measured another 14000 super feet of it. I may 
say without hesitation that it is very durable, and superior to the 
E. saligna that grows here. (The local saligna appears to be of average 
quality J. H. M.). ‘I again interviewed one of the sawmillers who is 
sawing some of it, and was informed by him that the White Gum will 
keep, and he intends to lay in a stock of it, The logs will not crack 
with the sun like Blue Gum does; altogether it is a tougher timber than 
Blue Gum, and it becomes pretty hard when it is exposed to the sun 
for a year or two. It is used for general building purposes, joists, 
rafters, etc.“ Juvenile foliage. —.Nearly eordate to broadly lanceolate 
(often up to 4 inehes long and 2 inches wilde while still in the oppo- 
site stage); petioles thin, and usually from !/, to ?/, inch. Texture thin, 
undulate. Bright green, paler on the underside; oil-dots abundant, the 
midrib conspicuous (particularly on the underside), the primary veins 
roughly parallel, and at an angle of about 45? with the midrib; intra- 
marginal vein at some distance from the edge. Mature foliage. — 
Lanceolate leaves with petioles of an inch and more; 6 inches and more 
in length, with a usual breadth at the widest part of 1 to 1!/, inches. 
Of medium texture; oil-dots abundant. Midrib very conspicuous (white); 
penniveined; intramarginal vein wellremoved from the edge. The mature 
leaves resemble those of the well-know E. tereticornis a good deal. Twigs 
often angular. I expect this species will jield a good percentage of oil. 
Buds. — Symmetrical in shape, the opereulum conical, and the calyx of 
similar size and shape, tapering into the rather short pedicel. Flowers. 
— Rather small; usually 3 to 5 in the umbel; anthers with parallel 
cells. Fruits. — Hemispherical, barely !/, inch in diameter, abruptly 
tapering into a pedicel of the same length. Peduncle of about !/, inch. 
Rim narrow and rather sharp, valves well exserted and mostly 4 in the 
Specimens seen, | 
