4 Weiss, Alien Agnatic Plants in the Reddish Canal. 



able to find on our last two visits. The Chara Braunii 

 (Gmel.) seems very evenly distributed along the warmer 

 parts of the canal, and does not seem to have been affected 

 by the deterioration of the water. It occurs quite plentifully 

 in the middle of the canal opposite the new Kroadstone 

 Mill, and reaches from station i on the map, without 

 interruption to 7. Beyond that point it disappears 

 probably partly owing to the lower temperature and partly 

 to the greater vigour and abundance of Elodea and other 

 more hardy waterweeds. It reappears however, in stations 

 13 and 14, opposite other inflows of warm water from the 

 furthest cotton mill. 



Portion of Manchesikr and Ashton-under-Lyne Canal. 



Mixed with the Chara and the Elodea, one finds in 

 the deeper water several small algae ot which Cladophora 

 gloinerata is perhaps the most abundant, while Pithophora 

 which is closely allied to Cladophora, with which genus it 

 has sometimes been confused, is of more interest, being a 

 freshwater alga of almost exclusivel\- tropical distribution. 

 It was observed growing on some living plants of A^^/^j 

 graminea which we sent by Mr. Charles l^ailey to the 

 British Museum, and was described b}- ^ Dr. Rendle and 



* A, B. Kendle and VV. WcnI, Jiini. "A New liiiiish lic.sluvaler 

 alya." founial of liolaiiy,\K)\. y], 1899. 



