116 THE JOURNAL OF BOTANY 
but quite intermediate in character (see p. 98). Orchis ——. 
Found by Mr. W. A. Shoolbred and himself, in quantity, at 
Inchnadamph, W. Sutherland ; a new form, allied to O. maculata 
Bleadon, N. Somerset; a good intermediate; apparently quite 
ound i 
1890 at Inchnadamph, and again gathered in 1908; a modifica- 
tion of a 8. Greenland species. Hzeraciwm eustales Linton, from 
E. and W. Sutherland; an endemic species, previously known only 
from about four Perthshire stations. This exhibition was followed 
by Prof. F. E. Weiss, who showed some specimens of Compso- 
pogon, a tropical freshwater alga belonging to the Rhodophycee, 
which has been found in the Reddish Canal near Stockport. The 
water in this part of the canal is warmed the inflow of hot 
water from the cotton mills, and other subtropical aquatics have 
been found there in the past—Naias graminea, Chara Braunii, and 
Pithophora Oedogonia. They are supposed to have been intro- 
duced with refuse from the cotton mills. 
TE fourth volume of Messrs. Elwes and Henry’s handsome 
and important work The Trees.of Great Britain and Ireland treats 
of Abies, Castanea, Fraxinus, Celtis, Alnus, Betula, and one or two 
smaller genera. In this Journal for 1906 (p. 382) we gave some 
Alnus glutinosa is A. rotundifolia Mill., yet this name is not even 
given in the synonymy. Betula verrucosa Ehrh, (1791) is retained 
oO 
the List of Seed-plants is called for. It is not easy to understand 
Mie. Britten, who 
. 
