196 THE MARINE BOTANIST. 



GELIDIUM COENEUM.— HORNY 

 GELIDIUM. 



Frond pinnate; branches linear^ attenuated at 

 each end. Pinnules mostly opposite^ spreading, 

 bearing within their tips elliptic tubercles. Colour 

 a dark red. Substance cartilaginous, firm, and 

 does not adhere to paper. Perennial. Summer. 

 Of common occurrence on rocky shores. This is 

 an extremely variable plant. Twelve varieties are 

 described by Dr. Greville in his ^^ Algae Britan- 

 nicae^" viz. : — 



h, sesquipedale. Frond four to eight inches high, 

 between compressed and flat, linear, tripinnate, 

 pinnae, attenuated at their base ; ramuli linear- 

 oblong, short obtuse. Sidmouth. 



c. pinnatum. Frond two to six inches high, 

 narrow, tripinnate ; the pinnae patent, nearly linear, 

 bluntish. Coasts of Devon and Cornwall, &c. Bute. 



d. uniforme* All the pinnae patent, attenuated 

 at the base, obtuse at the points, and scattered. 

 Ilfracombe. 



