P E E F A C E 



The long interval in time between the publication of Parts I. 

 and II. of the Monograph of British Lichens has been caused 

 by |;he continued ill-health and ultimate death of the Rev. James 

 Crombie, the author of Part I. Mr. Crombie had determined, 

 and partly arranged, a number of specimens, and had also begun 

 to prepare descriptions of the genera and species for Part II., 

 when the work was finally interrupted by his death in 1906. 

 His collections, together with his MSS., were generously pre- 

 sented to the Trustees of the British Museum by Mrs. Crombie, 

 and I was fortunately able to arrange with Miss Annie Lorrain 

 Smith to continue the work. In the preparation of Part II. 

 Miss Smith has followed the form and arrangement adopted in 

 Part I., except where divergence seemed absolutely necessary. 



A. B. REKDLE. 



Depabtment of Boiasv, 



British IXuseum (Natubal History), 



Cbomweli, Road, London, S.W. 



February 1911. 



