DISTRIBUTION OF THE LICHEN CHONDROPSIS SEMIVIRIDIS IN RELATION TO ITS HEAT AND DROUGHT RESISTANCE

Authors

  • R. W. ROGERS

    1. Botany Department, University of Adelaide, Adelaide, South Australia 5001
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      Botany Department, University of Queensland, St Lucia 4067, Australia.


  • This study formed part of a Ph.D. thesis submitted to the University of Adelaide. The study was supervised by Dr R. T. Lange and Dr F. A. Smith, and financed by grants from the Rural Credits Development Fund of the Reserve Bank of Australia, and the Nuffield Foundation.

  • The State herbaria of Queensland, New South Wales, Victoria and South Australia provided lists of collection locations for their holdings of Chondropsis semiviridis, as did Dr D. N. McVean and Dr G. C. Bratt for their personal holdings.

Summary

The distribution of Chondropsis semiviridis (FvM. ex Nyl.) Nyl. was mapped for Australia. Studies in gas exchange physiology demonstrated that length of drought is likely to limit distribution of the species. Similarly, it is shown that sensitivity to heat when wet is likely to prevent the species from establishing in arid areas with a summer rainfall seasons The surge of respiration upon wetting of lichen thalli noted by other workers was so short for C. semiviridis that it could not affect the limits of its distribution.

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