810 NOMENCLATURE OF ‘LONDON CATALOGUE.’ 
n the Westmoor district, near Chatteris, which seems to possess a 
power of living out of water almost equal to that of P. heterophyllus, 
a power not shared by the ordinary shallow-water Zizii-forms of 
the fens. 
. luce 
leaves in the fens. I carefully sought for them, but even in 
then, we have a remarkable physiological difference 
between P. lucens and P. Zizi, which can hardly be form 
rand have observed during the past summer induces me to 
believe ire present time, each form of the lucens grou 
t 
tray a comparatively recent common origin, but 
at the present day our fenland pondweeds certainly seem to be 
NOMENCLATURE OF THE EIGHTH 
THE «LONDON CATALOGUE.’ 
By B. Daypoy Jackson, Sec. L.8. 
(Continued from p. 233.) 
‘REMARKS ON THE 
EDITION OF 
ee : 961. The simiale land Aa ; = . . 
ee i ariety of the ash, Frazxinus excelsior 
Ss side teee Ait. Hort. Kew. iii. 445 (1789), has the later 
ome “ umplicifolia Willd. Berl. Baumg. 121 (1796), and S. 
ahl, Enum, i. 58 (1805). 
