ON THE WORLD'S "LICHENES EXSICGATL". 99 



Lecanora atra. 



Anzi: It. sup. IV, 168 A— C. (Huds) Ach. 

 — : Lieh. Ven. I, 32 (Huds.) 



Claud, et Harm.: Lieh. Gall. II, 79. Ach. 



Elenkin: I, 21. (Huds.) Ach. 



Floerke: D. L. 133. Ach. 



Fries: Lieh. Suee. VII, 203. 



Koerber: Lieh. Germ. 401. (Huds.) Kbr. 



Moug. et Nestl.: V, 458. Ach. 



Norrl. et Nyl. VI, 300. (Huds.) Ach. 



Rabh.: Lieh. Eur. IV, 95 (Huds.) Ach., VI, 169. Huds. 

 etc. 



In this preliminary publication of the titles of the exsiccates, 

 and the plan of my work I have given a catalogue of those 

 collections (Lichenes exsiccati), of which I know the lists. I have 

 had an opportunity of visiting the botanical museums of Berlin, 

 Kristiania, München, Stockholm, Upsala, and Wien myself, and 

 in every case I have copied the names of the collections, and 

 the Lichens distributed. I have also noted a few collections from 

 literature, but I dislike doing so, since authors too often think 

 themselves called upon to alter the names according to their 

 own views of nomenclature, and my work is essentially a 

 bibliography. 



Finally, I have also given a list of exsiccates, of which I 

 know only the titles, or a part of the contents, and indeed that 

 is my object in writing these pages. It is evident that it is 

 impossible for one man to view personally all the numerous 

 collections. I have already been obliged to appeal to the generosity 

 of lichenologists and museum officials for lists of missing collections. 

 In many instances I have received valuable assistance, lists, or 

 references to literature. I will now make a final effort and get 

 the index published. 



Should there be anyone who might be willing 

 to provide me with the items desired, or w h o 



