138 GELIDIUM. 



1. G. corneum, Huds. ; frond between cartilaginous and 

 horny, nearly flat, distichously branched ; branches linear, 

 attenuated at each end, pinnate and bipinnate ; pinnules 

 mostly opposite, patent, obtuse, bearing within their apices 

 elliptical tubercles, Grev. Alg. Brit. p. 141, t. 15; Hook. Br. 

 Fl. ii. p. 305 ; Wyatt, Alg. Danm. No. 30 ; Harv. Phyc. 

 Brit. t. liii. Fucus corneus, E. Bot. t. 1970. 



On rocky shores, very common. Perennial. Summer. Of this most 

 variable plant the following varieties are enumerated by Dr. Greville, in 

 his excellent ' Alga Brilannicte.' 



ft. sesquipedale ; frond 4 8 inches high, between com- 

 pressed and flat, linear, tripinnate, pinnae attenuated at their 

 base, rauauli linear-oblong, short, obtuse. 



Sidmouth, Dr. Greville. 



y. pinnatum ; frond 2 6 inches high, narrow, tripinnate, 

 the pinnae patent, nearly linear, bluntish. Turn. 



Coasts of Cornwall, Devonshire, &c., Hudson. Bute, Dr. Greville. 



d. uniforme ; all the pinnae patent, attenuated at the base, 

 obtuse at the points and scattered. Turn. 



Ilfracombe, Goodenough. 



e. capillaceum ; frond 5 or 6 inches high, narrow, pinnae 

 clustered towards its summits, nearly setaceous and some- 

 what erect. Turn. 



King's Cove, Cornwall, Turner. Sidmouth, Dr. Greville. 



. latifolium ; frond 2 or 3 inches long, 1 or 2 lines broad, 

 nearly flat, pinnae linear-lanceolate, mostly simple, set with 

 numerous, short, setaceous pinnulae. 



Trevone Bay, Cornwall ; and Torbay, Mrs. Griffiths. Sidmouth, Dr. 

 Greville. Malbay. 



. confertum ; frond 2 or 3 inches high, compressed re- 

 peatedly pinnated, pinnae and pinnulae long, very thin, acute, 

 and irregularly divided. 



Devonshire, Mrs. Griffiths. Bute, Dr. Greville. 



6. aculeatum ; frond 1 or 2 inches high, compressed, 

 very thin, pinnated very irregularly, pinnae divaricated, irre- 

 gularly divided, and set with minute, divaricate, subulate ra- 

 muli, crowded toward the summit of the frond. 



Mount's Bay, Mrs. Griffiths. 



i. abnorme ; frond 2 inches high, compressed, irregularly 



