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LIST OF THE BRITISH 



CI. SCHIZOTHRIX. 



Filaments involved in a thick lamellar sheath, rigid, 

 curled, thickened at the base. 



1. Schizothrix Creswellii. 



CII. Calothrix. 

 Filaments short, tufted, fixed at the base only. 



1 . Calothrix confervicola. 



2. „ Mucor, 



3. „ luteola. 



4. „ scopulomm. 



5. ,, fasciculata. 



6. ,, pannosa. 



7. „ hydnoides, 



8. „ caespitula. 



CIII. Lyngbya. 

 Filaments elongate, decumbent, flaccid. 



1. Lyngbya majuscula. 



2. „ ferruginea. 



3. „ Carmichaelii. 



4. „ speciosa. 



5. „ flacca. 



