260 Marine Algce of Berwick-on-Tivted. 



A pretty species, well marked by its brilliant green colour, and 

 very erect, appressed ramuli. When young the filaments are free, 

 or but very slightly matted together at the base, the colour is 

 very vivid, and the whole plant has a silky appearance which is 

 quite wanting in older specimens : in this state the plant is 

 Agardh's Cladophora vauchericeformis. When old the plant 

 becomes spongy owiug to the interlacing of the branches, " some 

 of which are strongly recurved and rhizoidal," and loses, to a 

 great extent, its beautiful green colour ; it then constitutes the 

 Cladophora centralis of Kutzing. 



Cladophora arctiuscula (Ktz.) Crouan, 



Alg. Mar. Finist., no. 376. — Spongomorpha arctiuscula, Ktz., 

 Tab. Phyc. iv. t. 75. 



Exsicc. Cladophora arctiuscula, Holmes, Alg. Brit. Rar., no. 31 ; Crouan, 



I.e. ; Desmaz., Exsicc no. 475. 

 Syn. Conferva arctiuscula, Crouan, Fl. Finist., p. 127. 

 Hah. On muddy sand-covered rocks in the shade near high-water mark. 



All the year. Rare. Coves, Sharper Head, near the " Needle 



Eye," Spittal. 



The filaments of this curious little plant are densely matted 

 together, and form indefinite cushion-like patches over muddy, 

 sand-covered rocks near high-water mark. The mode of growth 

 is very characteristic, reminding one more of a Vaucheria than a 

 Cladophora, but whether the plant is really anything more than 

 a form of the preceding species I am not prepared to say. 



Cladophora lanosa (Roth) Ktz. 



Phyc. Gen., p. 269. — Conferva lanosa, Roth., Cat. Bot. in., 

 p. 291. 



Descr. Cladophora lanosa, Harv., Phyc. Brit. 



Fig. „ „ Harv., I.e. pi. 6. 



Exsicc. Conferva lanosa, Wyatt, Alg. Danm., no. 194. 



Cladophora lanosa, Le Jol., Alg. Mar. Cherb., no. 3; Cm., Alg. 

 Mar. Finist., no. 374. 



Syn. Spongomorpha lanosa, Ktz., Tab. Phyc. iv. t. 84. 



Hab. On Polyides rotnndus, Ahnfeltia plicata, and other small Algas 

 between tide-marks. April — Aug. Rare. Coves, Sharper 

 Head, near the " Needle Eye," Rocks north of Dodd's Well. 



