Ghost gum may refer to a number of Australian evergreen tree speciesAustralian National Botanic Gardens http://www.anbg.gov.au/cpbr/cd-keys/euclid3/euclidsample/html/index_commonname.htm#G including:

Corymbia aparrerinja, a central Australian species Corymbia bella, a northern Australian species Corymbia blakei, an northeastern Australian species Corymbia dallachiana, an eastern Australian species Corymbia papuana, a northeastern Australian species Corymbia candida, a northwestern Australian species Corymbia dendromerinx, a northwestern Australian species

References