LIVERPOOL FEESH WATEE ALGM. 279 



S. orbicularis, Hass. 



Probably the same as S. crassa; not satisfactorily 



determined in the absence of the zygospores. 

 S. orthospira, Nag. 



Bromborough and Spital, (N). This species was 



recognised long ago by Mr. Archer in Ireland, but 



only discovered in England some few years since. 

 S. bellis, Hass. 



Bebington, C. (N) , Kensington, L. (N), Bromborough, 



(N, B, D), and other places not noted. 

 S. porticalis, rivularis and decimina. Bebington, C. (N), 



Bromborough, C. (N, B, D). 

 S. longata, Vauch. 



Bebington, C. (N), Bromborough, C. (N, B, D). 

 S. condensata, Vauch. 



Kensington, L. (N), Hooton, C. (N). 

 S.flavescens, Kiitz. 



Hooton, C. (N), Little Sutton, C. (N). 

 S. insignis, Hass. 



Kirkby, L. (N), Sefton, L. (N). 

 S. calospora, Cleve. 



Kirkby, L. (N), Spital, C. (N). 

 S. tenuissima, Hass. 



Found in several places along with the above named 



species. 

 S. quadrata, Hass. 



Sefton Park, L. (B). 

 This list does not include all species of the Zygnem- 

 acese found, but only those whose specific characters 

 could be determined. The difficulty of securing specimens 

 containing the zygospores compelled the writer to exclude 

 many and even to leave a few of the present list in doubt. 

 Zygonium ericetorum var. aquaticum, D.By. 



Several places but not in reproduction. 



