240 Marine Algub of Berwick- on-Tweed. 



Hab. \n shallow mud-bottomed pools near high water mark, usually 

 mixed with Microcoleus chthonoplastes and other Nostochineae. 

 Aug. — Nov. Rare. Greenses, Fenham Flats, Holy Island. 

 Distinguished from L. astuarii by the diameter of the fila- 

 ments which are from 008 — -009 mm. in thickness. The colour 

 of the filaments is greenish-yellow, or brown becoming brighter 

 in drying or after it has been in the herbarium for a few weeks. 



Lyngbya stragulum, Ktz. 



Phyc. gen. p. 223; Id., Spec. Alg., p. 280. 

 Descr. Lyngbya stragnlum, Ktz., I.e. 

 Fig. „ ,, Ktz., Tab. Phyc. t. 8G. 



Hab. On mud-covered rocks and in shady tide-pools near high-water 



mark in company with Microcoleus nigrescens, Sphacelariu 



radicans, etc. July — Nor. Rare. Rocks north of the Target 



at Dodd's Well. 



A small species of a bluish-grey colour with filaments about 



the same thickness as those of Lyngbya luteo-fusea. Except that 



in Symploca fasciculata, the filaments are united into tooth-like 



bundles by a mass of jelly there is nothing to separate it from 



this species. 



NODULAEIA, Mertens. 



Nodtjlaria Harveyana (Thw.) Thur. 



Class, des Nostoch, 1 c, p. 378. — Spermosira Harveyana, 

 Thwaites in Phyc. Brit. 

 Descr. eh Fig. Spermosira Harveyana, Harv. Phyc. Brit., pi. 173c ; 



Farlow, Mar. Alg. New Eng., p. 31 (sub. Nodularia.) 



Hab. In shallow pools of brackish water usually mixed with other 



Nostochinese. Aug. — Nov. Rare. Banks of the Tweed both 



above and below the railway bridge. 



SPHiEKOZYGA, Ag. 



Sph^erozyga Carmichaelii, Harv: 

 Phyc. Brit., pi. 113a. 



Descr. Sphsorozyga Carmichaelii, Harv., I.e. et Farlow, Mar. Alg. New 



Eng., p. 30. 

 Figs. „ •• Harv., I.e. pi. 113a ; Farlow I.e., pi. I., 



fig. 3. 

 Syn. Cylindrospermnm Carmichaelii, Ktz. Spec. Alg., p. 294. 

 Anabaina Marina, Brdb. in Ann. Sc. Nat. 



Belonia torulosa, Carm. Alg. Appin. MS. : Harv. Man., 1st Ed. 

 p. 167. 

 Hab. On the muddy bottoms of shallow pools of brackish water. July 

 — Oct. Not uncommon. Banks of the Tweed. Fenham Flats. 



