Marine Alg<% of Berwick-on-Tweed. 255 



Hah. On rocks, and entangled amongst other Algae, in shallow pools 



between tide-marks. May — Oct. Rare. Coves. Scremerston, 



Holy Island. 



A more slender species than any of the preceding, forming 



dark green, woolly strata over other Algse, or more rarely on 



rocks. The filaments, which are about the same thickness as, or a 



little thicker than those of Rhizoclonium riparium, are very much 



curled and twisted, and intricately interwoven into loose, woolly 



masses. 



ULOTHRIX (Ktz.) Thur. 



Ulothrix implexa, Ktz. 

 Spec. Alg., p. 349. 

 Descr. Ulothrix implexa, Ktz., I.e. ; Hauck, Meeresalg, p. 441. 

 Fig. „ „ Ktz., Tab. Phyc. n., tab. 94; Hauck, I.e. 



Exsicc. „ ,, Hauck et Bichter, Phyk. Univ., no. 72. 



Syn. Hormidium implexum, Ktz., Bot. Zeit. 1847, p. 147. 



Ulothrix snbmarinum, Ktz., Spec. Alg. et Tab. Phyc. I.e. 

 Ulothrix flacca, Havel; Beitr. 1877, p. 298; Dndel, Tllnstr. 



Pflanzenleben., p. 148, fig. 28. 

 Ulothrix Cutlerire, Le Jol., Liste, p. .56, (non Lyngbya Cutlerise, 

 Harv.) 

 Hah. On rocks, near high-water mark, exposed to the drip of fresh- 

 water. Jan. — May. Rare. Sharper Head, Needle Eye, Coves. 



By far the most slender of all the British marine species of 

 Ulothrix. In my specimens the filaments are from -0065 — -009 

 m.m. in diameter, the cells from •005 — 017 m.m. in length, 

 generally about as long as, or a little longer than broad. 



Dr. Bornet informs me that this plant, which, following 

 Hauck,I have referred to Kutzing's Ulothrix implexa, is identical 

 with the Ulothrix Cutlerm of Le Jolis's " Liste " that is to say 

 Le Jolis considered the plant was the same as Harvey's Lyvgbya 

 Cutler ice. 



Professor E. Perceval Wright has kindly searched the Harveyan 

 Herbarium at Trinity College, Dublin, but could find no 

 specimens of Li/nghya Cutlerue, so that the specimen in the 

 Harveyan Collection, belonging to the Linnean Society appears 

 to be the only type specimen of this plant in existence. 



I have by permission examined this specimen and find that 

 although indistinguishable from Ulothrix speciosa, it is quite 

 distinct from the present species, 



