854 NOTES ON PONDWEEDS, 
Continued cultivation of the plant through the past summer in 
still deeper water brought out the normal character of the species, 
which is figured in Pl. 887, fig. 2. is state would be named 
P. varians, or of P. heterophyllus y. major (Ar. Bennett, Lond. 
Catalogue, ed. 8). 
mong specimens collected at Sutton Meadlands, Cambridge- 
shire, in September, 1892, I found a Potamogeton which was 
growing wit. - varians, and which I referred at the time to 
that species, but which I now have little doubt is really of the 
same hybrid origin as P. Billupsii, i.e., P. coriaceus x P. planta- 
meus. 
The chief interest this new form will have for botanists is its 
bearing on the question of what many of the fenland forms of 
“P. Zizit” really are. ; tt visi 
Sutton Meadlands with me, he suggested the possible crossing of 
P. plantagineus wi me o ir 
attention to the matter; although at that time we were neither of 
us prepared to admit that any of the plants we then examined were 
really hybrids. 
Here I may say that I have not used the corrected nomen- 
clature of the species of Potam 
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considerably from the “ Zizii” of these notes; which I have so 
nts 
th ephew, Mr. C. K. Billups, whose name I have attached to 
€ species described in this paper, assisted me greatly in the field- 
ry ; : 
