86 



LIST OF THE BRITISH 



Order XVIII. NOSTOCHACEJE. 



Green, fresh-water, or rarely marine Algae, composed 

 of moniliform filaments, lying in a gelatinous matrix. 



CVII. MoNORMIA. 



A single filament enclosed in a convoluted, gelatinous, 

 and branching frond. 



1. Monormia intricata. 



CVIII. Spilerqzyga. 

 Filaments free, separate, naked. 



1. Sphserozyga Carmichaelii. 



2. „ Thwaitesii. 



3. ,, Broomei. 



4. „ Berkeleyana. 



5. „ Balfsii. 



CIX. Spermoseiea. 



Filaments free, separate, each enclosed in a very deli- 

 cate membranous tube. 



