Marine Algce of Berwiek-on-Tiveed. 347 



Reinsch's geuus Choreocolax,oi which he figures several species, 

 was founded on barren specimens, and not improbably contains 

 plants belonging to more than one genus. Schmitz and Eeinke 

 have consequently removed the present species, of which the 

 fructification is known to a new genus. 



Harveyella mirabilis is a true vegetable parasite. It consists 

 of rose coloured filaments which are parasitic in the fronds of 

 Rhodomela subfusca, producing irregularly shaped convex masses 

 on its stems. These masses are composed partly of the filaments 

 of the parasite and partly of the distorted cells of the host plant. 



Family — S pongiocarpese. 

 POLYIDES, Ag. 



Polyides rotundus (Grmel.) Grev. 



Alg. Brit., p. 70, t. 11. — Fucus rotundus, Gmel., Hist. Fuc, 

 p. 110, t.-6, fig. 3 (excl. Syn. Huds. et Rail.) 

 Descr. Polyides rotundus, Haw., Phyc. Brit. 

 Fig. „ „ Harv., I.e. pi. 95. 



Exsicc. ,, ,, Wyatt, Alg. Damn., no. 161 ; Crouan, Alg- 



• Finist., no. 268 ; Le Jol., Alg. Mar. Cherb., no. 117. 

 Syn. „ „ Hook., Br. PI. n., p. 28J, ; Harv., Man., p. 146 ; 



Johnst., Fl. Berw. n., p. 233. 

 Polyides lumbricalis, Ag., Sp. Alg. n., p. 392 ; Ag., Syst. Alg., p. 

 194 ; J. Ag., Spec. Alg. n., p. 721 ; Id., Epicr., p. 629 ; Crouan, 

 Flor. du Finist., p. 154. 

 Furcellaria lumbricalis, Ktz., Phyc. Gen., p. 402 ; Ktz., Spec. Alg., 



p. 748 (non L amour.) 

 Spongiocarpus rotundus, Grev., Fl. Edin., p. 286. 

 Hab. On rocks and stones in sandy pools near low-water mark. Fruit 

 Nov. — March. Frequent. Berwick Bay, Burnmouth, Holy 

 Island. 



Family — R hodomelacese. 



ODONTHALIA, Lyngb. 



Odonthalia dentata (Linn.) Lyngb. 



ETydr. Dan., p. 9, t. 3. — Fucus dentatus, Linn., Syst. Nat. 



ii., p. 718 ; Id., Mant. p. 135. 

 Descr. Odonthalia dentata, Harv., Phyc. Brit. 

 Fig. „ ,, Harv., I.e. pi. 34. 



