SEAWEEDS. 315 
Laurencia obtusa, Lam. 
Cobo. Rocquaine. Bordeaux. Fermain. 
Laurencia hybrida, Lenorm. (LZ. caespitosa.) 
Common. 
Laurencia pinnatifida, Lam. 
Very common. 
Halopithys pinastroides, Kutz. (Aytiphloca.) 
Noted in Greville’s list. 
Chondria tenuissima, C. Ag. (Zawuzencia.) 
Belgrave Bay, plentiful. Cobo. 
Chondria dasyphylla, C. Ag. 
Fermain. Petit Bot. Vale Coast. Cobo. 
Polysiphonia sertularioides, J. Ag. (P. pulvinata.) 
Petit Port. Spur Point. 
Polysiphonia fibrata, Harv. 
Common. 
Polysiphonia urceolata, Grev. 
Petit Bot. 
Polysiphonia violacea, Wyatt. 
Rather common. 
(Polysiphonia fibrillosa, Grev., occurs in Alderney). 
Polysiphonia opaca, Zan. 
Petit Port, in sand at mid-tide level (f. s¢mZicior). This plant 
is an addition to the British flora. 
Polysiphonia fastigiata, Grev. 
Commen: parasitic on Fucus nodosus. 
Polysiphonia simulans, Harv. 
Fermain. Moulin Huet. Spur Point. 
Polysiphonia atro-rubescens, Grev. 
Petit: Part... Vazon: 
Polysiphonia subulifera, Harv. 
Belgrave Bay, in considerable quantity. Petit Bot. 
Polysiphonia obscura, J. Ag. 
Vazon Bay, in crevices of rocks at low-water mark. 
