OP NAIAS GRAMINEA, VAR. DELILEI. 65 



mogeton crispus, which becomes dwarfed^ particularly in 

 stations where there is an inflowing stream of warm 

 water. 



Two other plants which grow in the same canal ought 

 to be noticed in this connection. The first of these is the 

 Chara Braunii, Gmel.^ which the Messrs. Groves figured 

 and described in the '^ Journal of Botany^ for January 

 1884^ t. 242^ p. 3. This plant affects the edges of the 

 canal^ but it also occurs in the deeper water of the centre, 

 where it is more liable to be cut down by the passing 

 barges. Another interesting plant grows with the Char a ^ 

 whose identity is by no means settled, and it may prove 

 worthy of a more detailed notice, viz. a species of Zanni- 

 chellia, 



Mr. Whitehead had mentioned to me, on the occasion 

 of our joint visit, that Z.palustris had been recently found 

 in the canal, and, as it was an infrequent plant in the 

 district surrounding Manchester, I was anxious to procure 

 specimens, although it involved a moonlight search. It 

 was while hunting for this plant that, unknown to myself 

 or to my companions, I collected the Chara in the dark- 

 ness ; the specimens were very fragmentary, but from them 

 Mr. Arthur Bennett determined the plant to be the 

 Chara Braunii, new to the British Flora. In justice to 

 Mr. Whitehead it ought to be stated that he and 

 Mr. Armitage had collected it in the same station a fort- 

 night or so prior to my visit. 



The Zannichellia grows in the soft mud, in the shallower 

 parts of the canal, with Chara Braunii and Potamogeton 

 pusillus; it also occurs in places where the water scarcely 

 covers it. It would appear to flower and fruit in the mud 

 as well as in the water, but the fruits which are produced 

 in mud are of a very pale yellow-green, on account of 

 their imperfect exposure to the light. From the dwarf 



SEB. III. VOL. X. F 



