FRESH-WATER ALGAE. 323 
Chaetophora endiviaefolia, Ag. 
In pools at Grande Mare, scarce. 
PHYCOCHROMOPHYCEAE. 
Chroococcus turgidus, Nag. 
Grande Mare, common in one of my gatherings. 
Merismopedia glauca, Nag. 
In a ditch in Saints Bay Valley, plentiful. 
Nostoc commune, Vauch. 
Apparently not common in this island; I have seldom seen it. 
Nostoc verrucosum, Vauch. 
Plentiful in a streamlet flowing into Saints Bay Valley from the 
east side; less common lower down the valley. 
Cylindrospermum macrospermum, Kutz. 
In a water-trough at Casrouge, Forest. 
Oscillaria tenerrima, Kutz. 
Petit Port, at base of the cliffs, among other algae. 
Oscillaria tenuis, Ag. 
In a water-trough in Saints Bay Valley, and also in one near 
St. Peter’s Church 
Oscillaria limosa, Ag. 
Roadside ditch near ‘St. Sampson’s Badass 
Oscillaria nigra, Vauch. 
In a water-trough at Casrouge, Forest. 
Oscillaria Frohlichii, Kutz. 
In some of the pools at Grande Mare. 
Lyngbya vulgaris, Kirch. 
Common on damp earth and shady walls in the autumn. 
Tolvpothrix coactilis, Kutz. 
Grande Mare, in pools. 
Rivularia granulifera, Carm. 
Base of the cliffs at Petit Port. 
Gloiotrichia natans, Thur. 
In pools, Grande Mare. 
Gloiotrichia pisum, Thur. 
Adhering to submerged plants in deep pools at Grande Mare. 
