386 Mr Marsh, The History of the occurrence of Azolla, ete. ' 
species by Ostenfeld * in 1911, who found it at Woodbastwick, 
Norfolk, and at Queenstown Junction, Co. Cork. It was, however, 
present in this country before that time. The Sunbury record of 
A. caroliniana in 1910+ should certainly be ascribed to the other 
species, while the Azolla was noticed in the Norfolk Broads} 
before Ostenfeld’s identification. 
I have also seen fruiting specimens of A. filiculoides found in 
1912 at Almondsbury, West Gloucestershire, and kindly sent me 
by Miss I. M. Roper. The same species now ocenrs at Reading, 
where it is peculiar in being without the endophytic blue-green 
alga, Anabena, which usually inhabits the cavity of the upp 
leaf-lobe. 
At present A. filiculoides seems to be growing in importa 
as a constituent of British vegetation, for, as the result of the 
floods of 1912, it has been distributed over large areas in Norfolk. 
It is described as occupying a definite position as a member of the 
association of Typha angustifolia, especially in South Walsham and — 
Ranworth Broads §. 
A. filiculoides fruits quite readily in Europe. Both the 
specimens found by Ostenfeld were fruiting, the Almondsbury 
and the Sunbury plants were in fruit, and I obtained fruit last 
autumn, not only from Cambridge but, by the kindness of | 
Mr W. E. Palmer, of St John’s College (the author of the 
article in Nature), also from Norfolk. Ascherson and Graebner | 
also describe it as a freely fruiting species. 
In conclusion, I should like to suggest that it is of some 
importance to keep a look-out for Azollas in the British Isles as, _ 
in the event of their becoming important factors in our vegetation, 
as full a knowledge as possible of their early history in the country — 
would be of great interest and value. 
* Ostenfeld, loc. cit.; Report of the Bot. Hach. Club for 1912, pp. 220, 301. 
+ Rep. Bot. Exch. Club for 1910, p. 609; Journ. Bot. xuviit. p. 332, 1910. 
+ Rep. Bot. Exch. Club for 1910 and 1911, loc. cit. 
8 Palmer, ‘‘Azolla in Norfolk,” Nature, xc1t. p. 233,1913. The plant is wrongly 7 
named A. caroliniana, but I have seen fruiting specimens, which prove it to be : 
A. filiculoides. 
|| Loe. cit., p. 115. 
