ZYGNEMA. 155 



duction becoming angulated, the angles being situated at 

 the junction of the cells and produced by the tubes of com- 

 munication. Cells usually three times as long as broad. 

 Sporangia oval, producing considerable inflation of the re- 

 ceiving cell. 



Zygnema angulatum Hassall, in Annals of Nat. Hist, 

 vol. x. p. 41. 



Hob. High Beech, Essex; and Cheshunt: A. H. H. 

 Mayfield, between Sharp's Bridge and Piltdown Com- 

 mon ; Barcombe and Framfield : Mr. Jenner. 



The angular disposition of the filaments at the period of 

 reproduction is not peculiar to this species, the filaments 

 of most other non-conjugating Zygnemata being also angular 

 at that period. A variety of this species has occurred to 

 me, having cells only once and a half, or twice as long as 

 broad. 



32. ZYGNEMA MALLEOLUM Hass. 

 Plate XXXIV. Fig. 5. 



Char. Filaments of nearly the same diameter as those of 

 Zygnema parvum. Cells usually about six times as long 

 as broad. Sporangia producing considerable inflation of 

 the cells. 



Hal. Cheshunt: A. H. H. 



This would appear to be a distinct species, differing from 

 the following in the much greater length of the cells. The 

 empty cell taken in connection with the fruit-bearing cell 

 resembles somewhat in outline a hammer. 



33. ZYGNEMA AFFINE Hass. 

 Plate XXXIV. Fig. 6. 



Char. Filaments of nearly the same diameter as those of 

 Zygnema parvum. Cells usually twice or twice and a half 

 as long as broad. Sporangia oval, lodged in cells, which 

 are considerably inflated. 

 Hob. Cheshunt: A. H. H. 



