m the British Isles and in Europe generally. 385 
In England A. carolinianu was first obtained at Pindon 
(Middlesex), and an account of this is published in Science Gossip 
for 1883. It has been recently reported from various spots in the 
Thames valley, between Oxford and London, but it must be 
remembered that until Ostenfeld* pointed out the fact in 1912 
(from specimens found in 1911) it was not realised that we had 
any Azolla other than A. caroliniana. For instance, Druce + 
(1908) gives only one species, A. caroliniana. The following 
records for the British Isles have been published, though, until 
the material has been re-examined in the light of Ostenfeld’s 
discovery, they must be considered records an the genus rather 
than for the species. Azolla described as A. caroliniana has been 
found at Hayes Place (Kent), Oxford, Sonning, Henley, Enfield, 
‘Sunbury and Suleham{. Of these I have been able to examine 
material from Sunbury and Enfield kindly sent by Mr C. E. Britton. 
The Sunbury plant is A. filiculoides, the Enfield specimen A. caro- 
Tiniana. Another Azolla from Enfield was sent by Mr Holloway, 
but this was A. filiculoides. The Norfolk Azolla, which is good 
A. filiculoides, has also been several times referred to as A. caro- 
Tiniana. I have seen A. caroliniana from one other British locality, 
viz. Godalming, where it was found in 1913. 
__ The species is described by Ascherson and Graebner (1896) 
as fruiting only very rarely, they knowing of only one case of fruit 
being produced in Europe—a record from Bordeaux. No fruiting 
tmaterial has been found in the British Isles, although fruiting 
A. filiculoides has more than once been described under the wr ong 
‘specific name. 
_ Azolla filiculoides was introduced into Europe in 1880 by 
Roze§, who naively remarks, “Le climat de Bordeaux parait, du 
este, assez bien convenir 4 ces deux especes américaines, car 
quelques poignées de la premiere [A. carolimand | en 1879, et de 
la seconde [A. filiculoides| en 1880, jetées ga et 1a dans les fossés 
des marais de cette ville, ont donné naissance & une légion in- 
nombrable de ces plantes, qui ont envahi presque tous les fossés, 
tnares et étangs du département de la Gironde.” 
i It spread over many parts of France and then into other 
‘countries. In 1896 Ascherson and Graebner knew of it only in 
‘western and northern France. In 1900 it had reached Italy ||. 
| In the British Isles A. filiculoides was first noticed as a distinct 
* Ostenfeld, ‘‘Floristic Results of the International Excursion,” New Phyt. x1. 
jp. 127, 1912. 
| t Druce, List of British Plants, p. 88, Oxford, 1908. 
+ Reports of the Botanical Te anee Club, 1910, p. 609; 1911, p. 56; 1912, 
pp. “186, 220; Journal of Botany, xu. p. 113, 1902; xuvuit. p. 332, 1910. 
§ Roze, “Contribution a l’étude de la fécondation chez les Azolla, ” Bull. de la 
Sac. bot. de France, xxx. p, 198, 1883. 
|| Saccardo, Cronologia, loc. cit.; Béguinot e Traverso, loc. cit. 
VOL. XVII. PT. Y. 26 
