Fresh-water AJgse, &c. By A. W. Bennett. 19 



Mesocaepe^. 



Mesocarpus scalaris dBy. ? Not seen in conjugation. 

 *Staurosp6rnmm capucinum Ktz. Bog pools, Mawgan. 



Siphoned. 

 Yaucheria sessilis Vaucli. Frequent. 



(Edogoniaoe^. 



BulbocLsete pygmaea Wittr. 

 Bog pools and running water, occasional. 



Batkachosperme^. 



*Cliantransia pygmsea Ktz. 

 In running water, Mawgan, along with a VaucJieria sp. indeterm., 

 and several Zygnemacese and Confervaceae. 



P.S. — Since writing the above, I have seen Eeinsch's paper on Lager- 

 heim's genus Acantliococcus in the ' Berichte der deutschen botanischen 

 Gesellschaft,' and recognize one or more of his species as having been 

 frequently seen by me in gatherings both in Westmoreland and Cornwall, 

 but have not preserved exact descriptions or drawings. No species of 

 the genus has as yet been recorded from the British Islands. Eeinsch's 

 surmise is probably correct, that they have been taken for zygospores of 

 desmids. They should be looked for by other observers. 



c 2 



