EUROPE AND NORTH AMERICA. 5 



synonymy of each species, and all have been consulted as far as 

 possible. 



Various Exsiccata have also been published, in which the 

 Sphagna are more or less completely represented, but the speci- 

 mens are not in all cases correctly named ; my Sphagnacecs 

 Britannicce Exsiccates will, I hope, remedy this, so far as the 

 British species are concerned, as well as more effectually illustrate 

 the forms described in the present work, though in this also a few 

 errors have been detected, which will be corrected under each 

 species described in the monograph. 



A work to comprise all the Belgian forms — Sphagnotheca 

 Belgica, by M. Gravet — is now in course of publication, but I 

 have not had the opportunity of consulting it ; neither have 

 I been able to inspect the various continental herbaria, and thus 

 place on record a more complete list of foreign localities ; I have, 

 however, made full use of the valuable papers published by 

 Professor Lindberg, and gathered together stray notes met with 

 in journals, in order as far as possible to extend our knowledge 

 of the distribution of these plants. 



