Marine Algce of Berwick-on-Tweed. 253 



GOMONTIA, Born, et Flak. 



Gomoxtia polyrhiza (Lag.) Bomet et Flahault, 



Note sur deux nouveaux genres d'algues perforantes, (Journal 

 do Botanique no. du 16 mai, 1888.) Codiolum polyrhizuni, 

 Lagerheim in Oefversigt of Kongl. Ventenskaps-Akade- 

 miens Foerhandlingar 1885 no. 8, p. 21, tab. xxviii. 

 Hab. On old shells. Not uncommon. 



One of the interesting class of perforating Algae, distinguished 

 at sight from Mastigocoleus by the grass-green colour of the 

 stains. 



CH2ETOMOKPHA, Kt%. 



Ch.etomorpha melagoxium (Web. et Mohr.) Kt%. 



Phyc. Germ., p. 204. — Conferva melagonium, Web. etMohr. 

 Reise, p. 194. 



P. TYPICA. 



Descr. Conferva melagonium, Web. et Mohr., I.e. 



Exsicc. Chaetomorpha melagonium, Wittr. et Nordst., Alg. Exs. no. 

 415. 



f. rupincola, Aresch. 



Conferva melagonium, var. rupincola, Aresch., Alg. Scand. 

 Exs. no. 275, a. 

 Descr. Conferva melagonium, Earv., Phyc. Brit. pi. 99 A. 

 Exsicc. „ „ var. rupincola, Aresch., i.e. Wyatt, Alg. 



Danmon., no. 221. 



Hab. Forma typica at very low water mark and below. Forma 



rupincola in pools between tide-marks. All the year. Not 



uncommon, but never very abundant. Berwick Bay. Greenses. 



Burnmouth. 



Easily distinguished from all other British Chatomorphce by 



its stiff rigid habit and glaucous green colour. The form growing 



between tide-marks is met with in deep pools, attached to stones 



and rocks, usually in single specimens or but very few together. 



Chaetomorpha ;erea (Dillw.) Ktz. 



Spec. Alg., p. 379. — Conferva serea, Dillw., Conf. t. 80. 

 Descr. et Fig. Conferva serea, Harv., Phyc. Brit. pi. 99, B. 

 Exsicc. ,, ,, Wyatt, Alg. Danmon., no. 191. 



Syn. Chaetomorpha gallica, Ktz., Spec. Alg., p. 378. 



