Marine Algae, of Berwick-on-Tweed. 257 



EtDsicc. Hormotrichum flaccum, ' Crouan, Alg. Pinist., no. 347 ; Lyngbya 



Carmichaelii, Wyatt, Alg. Danm., no. 230. 

 Syn. Lyngbya Carmichaelii, Harv., Phyc. Brit. pi. 186a. 

 Hormotrichum flaccum, Ktz., Spec. Alg., p. 381. 

 Hormotrichum Carmiohaelii, Ktz., Spec. Alg., p. 382. 

 Hormotrichum fasciculare, Ktz., Spec. Alg., p. 382. 

 Conferva flacca, Eng. BoL, t. 1943; Johnston, Fl. Berwk. n., p. 



253. 

 Lyngbya flacca, Harv., I.e. 

 Hob. Epiphytic on various Algae, especially the Fuci ; also on rocks 

 and timber. Jan. — May. Common. Berwick Bay. Burn- 

 month, Scremerston. 



Ulothrix speciosa (Carm.) Kt%. 



Spec. Alg., p. 348. — Lyngbya speciosa, Carm., Alg. App. 

 ined. 

 Descr. Lyngbya speciosa, Harv., Phyc. Brit. 

 Fig. „ „ Harv., I.e. pi. 186. B. 



Exsicc. „ „ Wyatt, Alg. Danm., no. 196. 



Syn. Hormotrichum speciosum, Cm., Alg. Mar. Finist., no. 349. 



Ulothrix speciosa, Ktz., Tab. Phyc. n., t. 93. 

 Hah. On rocks from near high-water mark to half-tide level. Jan. — 



March. Pare. Greenses. Rocks north of Dodd's Well. 

 Although closely related to Ulothrix isogona the present species 

 is brighter coloured and much more lubricous, adhering closely 

 to paper in drying. The filaments too, have a wavy appearance 

 which serves to mark the species. Ulothrix isogona, on the other 

 hand, adheres very imperfectly to paper, is very brittle when 

 dry, and the filaments do not become curled. Both species are 

 distinguished from Ulothrix flacca by the much greater diameter 

 of their filaments. 



Ulothrix isogona {Eng. Bot.) Thur. 



in LeJol., Liste Alg. Mar. Cherb., p. 57. — Conferva isogona, 

 Eng. Bot., t. 1930. 

 Descr. Ulothrix isogona, Farlow, Mar. Alg. New Eng., p. 45. 

 Fig. Conferva Youngana, Harv., Phyc. Brit. pi. 328. 

 Syn. Hormotrichum isogonum, Ktz., Spec. Alg., p. 382. 

 Urospora penicilliformis, Aresch., (in part.) 

 Conferva Youngana, Dillir., Conf. t. 102 ; Harv., I.e. (non Crouan, 



Alg. Finist., no. 350.) 

 Hormotrichum Younganum, Ktz., Spec. Alg., p. 382. 

 Hah. On exposed rocks and timber near high-water mark. Jan. — Aug- 

 Not uncommon. Berwick Bay, Scremerston, Holy Island. 

 1 H 



