MAKINE ALGiE. 



55 



XXXVIII. BOSTRYCHIA. 



Frond dull purple, filiform, much branched, dotted. 

 Apices strongly involute. Fructification twofold. 



1. Bostrychia scorpioides. 



XXXIX. Bytiphljsa. 



Frond filiform or compressed. Branches transversely 

 striate. Fructification twofold on distinct plants. 



1. Kytiphlsea pinastroides. 



2. „ complanata. 



3. thuyoides. 



4. „ fruticulosa. 



XL. POLYSIPHONIA. 



Frond filamentous, partially or generally articulate. 

 Articulations of the ramuli two or many-tubed. Tetra- 

 spores on distorted ramuli. 



1. Polysiphonia urceolata. 



var. patens. 



2. 

 3. 

 4. 

 5. 

 6. 



formosa. 



stricta. 



pulvinata. 



fibrata. 



spinulosa. 



