130 
B. Millard Griffiths. 
Now tubers are quite unknown upon true leaves, while of frequent 
occurrence on stolons. There is thus a strong presumption that 
Utricularia will also exemplify what appears to be a universal 
principle. 
The view here advocated, that the runners of Utricularia are 
caulome structures and that the “ leaves ” are of the nature of 
phylloclades, has the merit of bringing a very anomalous genus into 
line with the majority of flowering plants. It requires no such 
remote morphological assumptions as the opposed view involves: 
and is without the theoretical demerit of the contrary view, in that 
it does not tend towards an abolition of morphological categories. 
ON TWO NEW MEMBERS OF THE VOLVOCACE/E, 
By B. Millard Griffiths, B.Sc. 
(University Scholar, Birmingham). 
[[Text-Figs. 13—15.J 
INCE October, 1908, I have been carrying on an investigation 
of the Algae of Stanklin Pool, near Kidderminster, largely 
with the view of accumulating data concerning any possible winter 
stages of these plants, and also to ascertain to what extent they 
pass the winter in the vegetative condition. 
This work, which is still proceeding, was undertaken at the 
suggestion of Dr. G. S. West, and is being carried out under his 
direction. 
The pool is a very old one, fed by bottom springs, and has 
yielded a number of interesting algae, among which two species of 
the Volvocacece have been particularly noticeable. As these are 
both forms of considerable interest, it has been thought best to 
issue a separate article on them. 
