THE FRESH-WATER ALGM OF ESSEX. 1 79 



S. oscillarioides, Turp. Cooke, t. 96, f. 3. In ditches, 

 Epping(G.E.M.). 



Oscillaria tenerrima, Kutz. Cooke, t. 96, f. 4. In ditches, 

 Chingford. 



O. tenuis, Ag. Cooke, t. 96, f. S. In ditches, Kelvedon 

 (E.G.V.) ; Chingford. 



O. muscorum, Carm. Cooke, t. 98, f. 8. On Hypnuin, 

 Kehedon (E.Cr.\'.). 



O. limosa, Ag. Cooke, t. 97, f. 3. In ditches, Kelvedon 

 (E.G.V.). 



O. nigra, ^'auch. Cooke, t. 97, f. 6. In ditches, Kelvedon 

 (E.G.V.). 



Microcoleus terrestris, Desm. Cooke, t. 99, f. 2. On the 

 ground, Kelvedon (E.G. A'.) 



Lyngbya vulgaris, Kirsch. Cooke, t. 102, f. 5. On the 

 ground, Kelvedon (E.Cx.V.). 



Gloiotrichia natans, Thur. Cooke, t. 116, f. i. In ditches, 

 Feering (E.G.V.). 



G. pisum, Ag. Cooke, t. 116, f. 2. In ditches, Epping 

 (G.E.M.). 



BATRACHOSPERME.^.. 



Batrachospermum moniliforme. Roth. Cooke, t. 120. 

 In ditches, Kelvedon ; Rivenhall (E.G.V.) A^ar. confusuni, Hass. 

 Cooke, t. 123. Feering; Coggeshall ; Kelvedon (E.G. A".). War. 

 sfagiiak, Ag. Kelvedon; Coggeshall (E.G.A'.). 



B. vagum. Roth. Cooke, t. 125. In ditches, Rivenhall 

 (E.Ci.V.). 



B. atrum, Harv. Cooke, t. 126, f. i. In ditches, Kelvedon 

 (E.G.V.). 



DOUBTFUL SPECIES. 



Lyngbya thompsoni, Harv. Hass., p. 222. On stick in a 

 pond, Kelvedon (E.G.V.). 



L. punctalis, Hass. Hass., t. 60, f. 4. In an aquarium, 

 Kelvedon ; Felix Hall (E.G.V.). 



L. vermicularis. Hass., t. 60, f. 5. In ditch, Feering ; Tip- 

 tree Heath (E.G.\'.). 



L. cinerea (Oscillatoria, Hass.). In ditch, Kelvedon 

 (E.G.V.). 



N 3 



