382 THE ALG.E OF GUERNSEY. 



Stigeoelonium tenue, Ag. Moulin Huet Cascade. Stream behind Ivy 



Castle. J 



ChSBtophora tuberculosa, Roth. Plentiful in a water trough at the 

 Corbiere. 



C endivsefolia, Ag. In pools, Grande Mare. 



Chrooeoeeus turgidus, Nag. Grand Marc. 



Merismopedia glauea, Nag. Saints' Bay Valley, plentiful. 



NostOC commune, Vauch. Not common. 



N. verrueosum, Vauch. Abundant in streamlet flowing into Saints' Bay 

 Valley from La Fosse. 



Cylindrospermum maerospermum, Kutz. In a water trough at Le 

 Casrouge. 



Oseillaria tenerrima, Kutz. Petit Port, at base of cliffs. 

 0. tenuis, Ag. In a water trough in Saints' Bay Valley, and in one near 

 St. Peter's Clmrch. 



0. limosa, Ag. Eoadside near St. Sampson's Bridge. 

 0. nigra, Vauch. In a water trough at Le Casrouge. 

 0. Frohliehii, Kutz. Grande Mare. 



Lyngbya vulgaris, Kirch. Common on damp earth and shaded walls in 

 the autumn. 



Tolypothrix COaetilis, Kutz. Grande Mare. 



RlVUlaria granulifera, Carm. Base of the cliffs at Petit Port. 



Gloitriehia natans, Thur. In pools, Grande Mare. 



G. pisum, Thur. Adhering to submerged plants in pools, Grande Mare. 



Chantransia Chalybea, Kutz. On stones in a rivulet behind Les Vaux- 



belets. 

 Batrachospermum moniliforme, Roth. Grande Mare. 



DESMIDIACE^:. 



LeptOCystinema Kinahani, Arch. I once found this singular desmid in 

 considerable abundance in a trickling streamlet in the Saints' Bay Valley. 



Cosmarium tetraophthalmum, Kutz. Grande Mare. 



C margaritiferum, Meneg. Grande Mare. 



C. Botrytis, Meneg. In a water trough at the Corbiere. Very scarce. 



Doeidium truneatum, Brcb. Grande Mare. 



ClOSterium Lunula, Ehr. Grande Mare, not uncommon. Saints' Bay 

 Valley. 



C. acerosum, Ehr. Not uncommon in water troughs and wells. 



C. Ehrenbergii, Meneg. "With the last, rather common. 



C. DianSD, Ehr. Grande Mare. Water trough at King's Mills. 



