280 THE MARINE BOTANIST. 



in the same situations. Perennial, bears fruit in 

 winter. Filaments slender, short, erect, much 

 smaller than in C. floridulum, and distinguished 

 from it by the clustered arrangement of the tetra- 

 spores, which in that species are borne singly, and 

 in a secund manner along the branches. Colour a 

 dull red. Height of the filaments never above half 

 an inch. 



C, floridulum. See description. 



C. mesocarpum. Rocks at the extremity of low 

 water-mark. Appin, Argyleshire. — "Tufts con- 

 tiguous, forming a broad shaggy purple crust." 

 Filaments minute; branches virgate. Tetraspores 

 crowded about the middle of the filaments on forked 

 peduncles, secund or opposite. 



Section 6. — Parasitica. Minute parasites. 

 (7. sparsum. On old stems of Laminaria sac- 

 charina at Appin, Argyle. On Conferva rupestris 

 at Miltown, Malbay. Scarcely a line high. 

 ^^Tetraspores obovate, sessile, mostly axillary." 

 It is better distinguished, Dr. Harvey says, from 



