326 THE BOTANICAL EXCHANGE CLUB OF THE BRITISH ISLES. 
of Nitdla ornithopoda, A. Braun, collected by the Rev. Canon 
Bullock Webster. This rare species has only been found in a small 
district in the West of France, from Angouleme in the north to the 
south of Arcachon, and doubtfully in one locality in Portugal. 
The especial interest of the specimens exhibited, which were col- 
lected to the south of Arcachon in March and April 1906, was that 
they represented gatherings of the plant from very different habitats 
and showed great variations. The plants collected in shallow 
ditches were already in full fruit, while those from running water 
and from Lake Cazan were quite immature, and so far sterile. 
Only a few specimens of this species have previously reached 
England, and the collection exhibited was probably by far the 
most extensive series of forms yet obtained. 
Braun recognized two forms — the more typical one almost 
resembling in habit some forms of our N. tenuissima (this form was 
called f. moniliformis by Prof. Migula), and the other var. laxa, 
which resembes N. gracilis. Among the specimens were some 
from roadside ditches near Arcachon, representing a third and very 
distinct form ; this may be called var. robusta. It is 4-5 in. high, 
very dark green, much more robust than the ordinary form, and 
with comparatively short ultimate rays to the branchlets, giving it 
the appearance of N. mucro 7 iata in miniature. 
N. ornithopoda is interesting as representing in Europe Braun’s 
section PoLVARTHKODACTYLAi. The headquarters of the species 
in this section is Australasia, where there are eleven species ; two 
reach north to Japan, and one occurs in India. Two or three are 
found in South America, and one in North America. Three species 
occur in Africa, one of which is also recorded by Dr. Nordstedt 
from Portugal. It is not quite certain that N. ornithopoda is 
distinct from this last. 
printeb Barnes parser an6 (to., Crown ]l?arO, Crforb. 
