30 president's address. 



gardener to my late uncle, T. Richardson), has just detected, in 

 Cleveland, four species new to science; one Biatora, one Verru- 

 caria, and two Arthonice ; of which, if you like, I can send 

 examples to mount, to show under the microscope at your meet- 

 ing. Just before the ' Phytologist ' stopped, I described Evernia 

 vul2yina, a tall-branched bright-yellow species, well known upon 

 the Continent, from examples collected in Ireland; and a couple 

 others, preserved as British, without special stations, in Dalton's 

 collection, which I had through my hands during the early part 

 of the year, to arrange for the Yorkshire Philosophical Society. 

 Ilieracium (a genus of composite plants, which, so far as flowers 

 go, look not very unlike dandelions), is attracting a good deal of 

 interest. A great Swedish botanist published, a few years ago, 

 a general monograph of the genus ; and it is found that our 

 British Hieracia need a great deal of revision, and that the 

 number of species which we possess is much greater than has 

 been supposed. The Backhouses, of York, have taken great 

 pains, during the last two or three years, to study them amongst 

 the Scotch Highlands, Teesdale, &c., and will probably be writing 

 upon them soon. Dr. Johnston and Mr. Embleton both kindly 

 forwarded me their collections of specimens from the Cheviots; 

 but I do not think that you possess anything in Northumberland 

 that we have not in Yorkshire." 



I prefer not to express an opinion on details as to any dif- 

 ferences of opinion in regard to the precise distribution of certain 

 species of plants in the North of England, because I am not 

 sufficiently acquainted with the scientific minutiae, by an exact 

 knowledge of which such variations of opinion can alone be 

 determined. I may however observe, that, as data for the reso- 

 lution of any such questions, it is requisite that accurate maps 

 should be prepared, showing not only the river basins, but also 

 the general range of elevation above the level of the sea ; and 

 the map which accompanies the Supplement to the North York- 

 shire Flora presents a clear and explanatory view of the several 

 river basins of the district, the arrangement and colouring being 

 remarkably distinct. I had hoped that the operations of the 

 Ordnance Surveyors, which have recently been in progress in 



