Actually the poem says "The stark white ring-barked forests, all tragic to the moon" but this white snow gum forest is not ring-barked, nor is it their normal healthy white ... this is the result of the bushfires that swept through the region in 2003. They are reshooting from the base and will recover but it will be a slow process.
At this altitude snow gums grow low and are usually twisted into fantastic shapes. The stuff of many awesome photographs, typically in the snow.
From The Snow Gum by Douglas Stewart
"It is the snow-gum silently,
In noon’s blue and the silvery
Flowering of light on snow.
Performing its slow miracle
Where upon drift and icicle
Perfect lies its shadow."