The response of eucalypt populations to a changing environment.

A large amount of genetic diversity in ecological traits exists both within and between the Tasmanian eucalypt species. This variation is generally associated with spatial variation in habitat. Major changes in the distribution of eucalypt species have no doubt occurred in response to past environmental changes and even today, populations are continually reacting to short- or long-term changes in the environment. The processes by which populations respond to environmental changes are addressed, with particular emphasis on gene flow and the role of hybridisation in the expansion and contraction of species ranges

The distribution and type locality of Eucalyptus cordata Labill. - an historical account

The natural distribution of the rare Tasmanian endemic Eucalyptus cordata is detailed. Discrepancies with distributional data in the literature are clarified. The type location previously indicated for the species is incorrect and the population initially collected bu Labillardiere at Adventure Bay in 1793 has been relocated after having eluded the attention of botanists for nearly two centuries

The Miena cider gum, Eucalyptus gunnii subsp. divaricata (Myrtaceae): a taxon in rapid decline

The new combination Eucalyptus gunnii subsp. divaricata (McAulay & Brett) B.M.Potts comb. & stat. nov. is introduced for the Miena form of the Tasmanian cider gum Eucalyptus gunnii Hook.f., once described as a separate species, E. divaricata McAulay & Brett. This subspecies occurs on the Central Plateau of Tasmania, where it intergrades clinally with E. gunnii subsp. gunnii and E. archeri. Core populations of this subspecies are among the most frost-resistant of E. gunnii sens. lat., have juvenile foliage of interest for floriculture and have been exploited historically for their sweet sap. However, high mortality of trees in the last decade, coupled with only rare seedling recruitment and poor seed crops, is threatening the long-term survival of this taxon in the wild. E. gunnii subsp. divaricata qualifies as Endangered under Commonwealth and Tasmanian legislation