x PREFACE. 
and other species, chiefly imported by himself, will also justify the 
author’s expressing his particular obligations to those gentlemen. 
It is only necessary to add that the total number of species 
included in this work amounts to 1980. Of those which are 
regarded as well established species the author has analyzed the 
organs of fructification of more than three fourths. 
London, October, 1840. 
Errem 
