Marine Algcv of Berwick-on-Tweed. 299 



Syn. Fucus bifurcarius, Gunn., Fl. Norw. I., p. 96. 

 ,, digitatus, Turner, Hist. Fuc. in., p. 66. 

 Laminaria pseudo-digitata, Lamour., Mscr. in Herb. sec. Le Jol. ,l.c. 

 ,, stenoloba, Be la Pyl., Observ. p. 118. 



„ digitata, J. G. Ay., Spetsb. Alg. Proge, p. 2 ; Kjellm., 



Vinteralgveg., p. 64, sec. Foslie. 

 Hafgygia digitata, var. stenophylla, Ktz., Spec. Alg., p. 577 (excl. 



syn.) ; Kleen, Alg. p. 33. 

 Laminaria stenophylla, Kjellm., I.e. p. 300. 



,, flexicaulis, Le Jol., I.e. 



Tangle, Cloust., I.e. 

 Exsicc. Laminaria digitata, Hohenack, Alg. Mar. Sice, no. 27. 

 „ ,, Aresch., Alg. Scand., no. 86. 



,, ,, var. brevipes, Crouan, Alg. Mar. Finist., no. 84. 



Laminaria ttexicaulis, Le Jol., Alg. Mar. Cherb., no. 151. 

 A common but very variable species, distinguished from 

 Laminaria hyperlorea by its smooth, somewhat compressed stems, 

 which are slightly attenuated at the base, and are destitute of 

 muciparous glands. A further mark of distinction is to be found 

 in the fructification, which in Laminaria hyperlorea forms large 

 indefinite patches spreading over the surface of the blade till 

 only very small portions of the unaltered frond are visible ; 

 while in L. digitata the spores and their accompanying para- 

 physes are collected into comparatively small, oval, or roundish 

 sori, scattered at wide intervals over the blade. These sori, 

 which are usually from half an inch to an inch and a half in 

 diameter, seldom become confluent, and never, so far as I have 

 observed, spread into large irregular patches as they do in L. 

 hyperlorea. 



Besides the varieties enumerated above, all of which are more 

 or less abundant with us, a form with very short slender stipes 

 and broad slightly divided laminae, very rounded, almost cordate 

 at the base, is occasionally washed ashore, I suspect that it is 

 Foslie's var. delilipes. 



In L. digitata the long slender root fibres are very numerous, 

 and usually intricately interlaced, the}' spread horizontally from 

 the base of the stem and form a sort of flat mat around it. The 

 secondary fibres are short and produced in groups at irregular 

 intervals along the primary fibres. Several plants are frequently 

 bound together by their interlacing root-fibres, which are often 

 so closely packed that no spaces can be seen between them, the 

 mass of interlaced roots forming an almost solid disc from which 

 the stems of the various plants arise. When washed ashore it is 



