SUPPLEMENT TO BOTANICAL REPORT — 1 878. 



43 



Pleurosigma attenuatum Sm. 



Roche Abbey and Goole. E. Hunter. 



P. acuminatum Sm. 



Roche Abbey and Goole. E. Hunter. 

 P. hippocampus Gi-im. 



Pinnularia viridis Rab. 



P. radiosa Rab 



Amphora ovalis Kg... 



A. littoral is Bonk 



A. hyalina Kg 



Roche Abbey. E. Hunter. 



Roche Abbey. E. Hunter. 



..Roche Abbey. E. Hunter. 



Roche Abbey. E. Hunter. 



Goole. E. Hunter. 



Gomphogramma rupestre^. ^r. Goole. J- Harrison. 

 Campylodiscus flexuosus. Roche Abbey. E. Hunter. 



S.W. 



S.W. 



S.W. 

 S.W. 

 S.W. 

 S.W. 

 S.W. 

 S.W. 

 S.W. 



THE 'NATURALIST.' 



The ' Naturalist,' the organ of the Yorkshire Naturalists' 

 Union, has during the year given a prominent position to botany, 

 especially cryptogamic botany. Among others may be mentioned 

 the papers by Mr. W. West on " Mosses," by Mr. Geo. Brook, ter., 

 on "Salmon disease in the River Eden" (caused by a fungus, 

 Achlya), by Mr. C. P. Hobkirk "On preserving Mosses," by Mr. 

 Thos. Hick on "Sexual Reproduction of Fungi," and by Dr. 

 Parsons on "Flowerless Plants and their Habitats," and the 

 bryological notes by the Rev. J. Fergusson, Messrs. J. Whitehead, 

 E. M. Holmes, J. S. Wesley, F. A. Lees, G. Stabler, &c. 



PROBLEMS OF PLANT DISTRIBUTION. 



Among the subjects discussed in the pages of the 

 ' Naturalist ' by members of the Union have been certain 

 interesting questions bearing on the distribution of plants. 

 One of these questions was — How comes Elodea canadensis, an 

 introduced species, of which only the female plant occurs in 

 Britain, and which therefore does not seed, to be found in 

 isolated and elevated ponds far removed from any navigable 

 waters? The explanation offered by the Rev. W. Fowler seems 



