Abstract
The effect of freezing temperatures on hardened and unhardened plants of some Australian temperate rain forest canopy species was investigated and the results discussed in relation to their current geographic range and ecology, and to the changes in distribution and evolution apparent from the fossil record. There was less difference among unhardened plants than among hardened plants, although Eucryphia milliganii Hook. f. which is restricted to high latitudes, commonly occurring at high altitudes, showed the greatest frost resistance, and Ceratopetalum apetalum D. Don., Doryphora sassafras Endl., and Atherosperma moschatum Labill., which are common subcanopy trees and extend to lower latitudes than the other species, showed the least frost resistance of the unhardened plants. Following a hardening regime, the general order of
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