NEW PUBLICATIONS. 45 



There is no doubt Professors Church and Dyer have done their work 

 well; there are no signs of patching up, but the whole reads consis- 

 tently and easily. Probably they could write a still better original 

 book on the subject, or on more general physiological botany, but the 

 present work is a real advance on existing English ones, and must 

 prove of use not only to agricultural students, but to all interested in 

 botanical science. 



Lichenes Britannici ; sea Lichenum in A>igUa, Scotia et Hibernia vi- 

 gentium eiiumeratio, cion eorum at'diouidus et distrihnt'wne. Scripsit 

 Rev. Jacobus M. Crombie, M.A., P.L.S. et Gr.S. London: L. 

 Reeve and Co. 1870. (Pp. 138.) 



In this little volume the author has catalogued all the British Lichens, 

 so far as they have been at present described, giving their general dis- 

 ti'ibution, and special localities for the less common species. Such a 

 work was much needed, for since tlie publication of Mudd's ' Manual' 

 in 1861, a large number of new species have been added to the Lichen 

 flora of these Islands, chiefly by Messrs. Carroll, Leigliton, Crombie, 

 and especially by the late Admiral Jones, whose untiring zeal did much 

 good service for British Lichenology. The total number of species 

 given in the Manual, — and it no doubt contains all that were known at 

 the date of its publication, — excluding the varieties, amounts to 485. 

 In the present work this number has been raised to 660, but as the 

 arrangement and limitation of the species in the two works is not pre- 

 cisely the same, no exact comparison can be made between them. In 

 the volume under notice, the arrangement of Ny lander has been strictly 

 followed ; and although this arrangement is defective in detail, yet in 

 the absence of a generally accepted classification, it perhaps fulfils the 

 oljject of the author as well as any other. 



The usefulness of Mr. Crombie's little work is considerably en- 

 hanced by the fact that it gives the nomenclature of all our British 

 Lichens as at present understood by Nylander, whose intimate ac- 

 quaintance with the contents of the Acharian herbarium has enabled 

 him to correct many false references to the types described by tiiat great 

 Lichenologist. We must protest, however, against the removal of 

 Borrera isioides, Borr. (E. B. Sup. 2808), to the genus Lecanoi-a. 



Collema dermatinum, Borr. (E. B, 2716), is doubtfully referred to 



