92 



Transactions British Mycological Society. 



My thanks are due to Mr C. T. Gimingham for information 

 regarding the displacement method of obtaining soil solutions; 

 to Mr C. Hunter for much valuable help and advice; and to 

 Professor O. V. Darbishire for his interest in the work. During 

 the progress of this investigation I have been in receipt of 

 a maintenance grant from the Department of Scientific and 

 Industrial Research. 



Cryptogamic Research Laboratory, 

 University of Bristol. 

 March 1923. 



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