Marine Algce of Beriuick-on-Tweed. 207 



Phyllitis filifokmis, Batters. 



Linn. Journ. Bot. xviii., p. 456, pi. 18 * 



Hab. Rocks near high-water mark. Jan. — March. Rare. Berwick 

 Bay, Sharper Head, Rocks a little south of Dodd's Well. 



A small winter species forming- indefinite patches, often a foot 

 or more in diameter, on rocks near high- water mark. The strap- 

 shaped fronds are scarcely thicker than ordinary sewing-thread, 

 and vary from an eighth of an inch to half an inch in length. 

 They are densely gregarious, and arise from a mass of fibrous 

 rootlets, not from a disk-like base, as in the preceding species. 

 The plant usually grows on rocks at extreme high-water mark 

 in places where it must remain high and dry for a considerable 

 portion of the day, whereas Phyllitis fascia, so far as I have 

 observed, always grows between tide-marks and usually in 

 pools where it can seldom if ever be left quite dry. 



SCYTOSIPHON (Ag.) Thuret. 



Scytosipiion lomentarius (Lyngb.) J. Ag. 



Spec. Alg. i., p. 126. — Chorda lomentaria, Lyngb., Hydr. 

 Dan., p. 74, t. 18. 

 Descr. Chorda lomentaria, Ifarv., Phyc. Brit. 

 Fig. ,, „ Harv., I.e. pi. 285. 



Exsicc. ,, ,, Wyatt, Alg. Danmou., no. 6. 



Soytosiphon lomentarius, Le Jol., Alg. Mar. Cherb., no. 198. 

 Syn. Chorda nluni, var. lomentaria, Ktz., Spec. Alg., p. 548. 

 Chorda listulosa, Zanard, Syn. Alg. Adr., p. 87. 

 Asperococcus castaneus, Carm. in Hool-., Br. Fl., vol. u., p. 277. 

 llab. On rocks and stones in pools between tide-marks. Fruit July and 

 Aug. Very common. Berwick Bay, Burnmouth, Spittal, Holy 

 Island. 



Family— P unctariacese- 



LITOSIPHON, Harv. 



Litosiphon pusillus (Carm.) Harv. 



Man. Ed. 2, p. 43. — Asperococcus pusillus, Carm. in Hook., 

 Br. Fl. ii., p. 277. 

 Descr. Asperococcus pusillus, Harv., Phyc. Brit. 



* The Liunean Society have kindly permitted this plate to be reprinted 

 to illustrate the present paper. (It is now Plate VIII.) 



