238 Marine Alga? of Berwick-on- Tweed. 



Descr. Microcolens ehthonoplastes, Farlow, Mar. Alg. New Eng., p. 33. 

 Figs. Microcoleus anguiformis, Hart., Phyc. Brifc. pi. 24-9 ; Ktz., Tab. 



Phyc, i. fc. 57 ; Farlow, I.e. pi. n., tig. 3 

 Syn. Chthonoblastus anguiformis, Rabenhomt, Flor. Eur. Alg. sect. n.. 



p. 133.— Chthonoblastus Lyngbei, Ktz., Spec. Alg., p. 262 ; Id. 



Tab. Phyc. i. t. 58. 

 Hub. On the muddy bottoms of shallow pools of salt or brackish water. 



July — Oct. Not uncommon. Fenham Flats. Holy Island. 



Microcoleus NJGRESCENS, Thuret rnscr. 



Rah. On the bottoms of shallow, shady rock pools near high water 



mark. July — Aug. Rare. Beyond the target at Dodd's Well. 



and in crevices of the rocks in the caves. 

 I am indebted to Dr. Hornet for the identification of this 

 species. T do not know if any description of it lias been pub- 

 lished. It forms thin blackish or brownish-black layers on the 

 bottoms of shady rock pools near high water mark, and in 

 crevices of the rock in caves. The stratum is more or less 

 membranous and can be torn from its attachment in pieces of 

 considerable size, often an inch or more in diameter. The fila- 

 ments in each sheath are few, the sheaths very thin, and difficult 

 to see when the plant is re-moistened after having been dried. 



SYMPLOCA, Ktz. 



Symploca Hakvkyj, Le Jol. 



Liste des Alg. Mar. Cherb., p. 29. 

 Descr. et Fig. Calothrix semiplena, Harv., Phyc. Brit. pi. 309 (non aliorum. ) 

 Exsicc. Symploca Harveyi, Le Jol., Alg. Mar. Cherb., no. 139. 

 Syn. Schizosiphon Harveyi, Crouan, Flor. Finist., p. 110. 



Calothrix hydnoides, Cm.. Alg. Mar. Finist.. no. 345 (non 

 Carmichtiel.) 

 Hob. In shallow tide-pools near high water mark, growing in company 

 with Catenellu Opuntia. Summer and Autumn. Rare. 

 Farthing Bay, Scremersfcon. 



Symploca fasciculata, Ktz. 

 Spec. Alg., p. 272. 

 Descr. Symploca fasciculata, Farlow, Mar. Alg. .New Eng.. p. 184. 

 Fig. ,, ,, Ktz., Tab. Phyc. I. t. 75. 



Exsicc. ,, ,, Holmes, Alg. Brit. Bar. Exsicc., no. 74. 



Rah. On mud-covered rocks near high-water mark. Aug. — Sept. 



Rare. Farthing Bay : Coves, Holy Island. 

 Very closely related to Symploca Harveyi, but the filaments 

 are slightly larger, varying from OU9 — -01 1 mm. in diameter. 



