234 KJELLMAN, THE ALG OF THE ARCTIC SEA. 
Laminaria Agardhii Ksrium. 
Spetsb. Thall. 2, p. 18. 
Descr. Waminaria caperata J. G. AG. Lam. p. 13. 
» Agardhii Kye.im. 1. ec. 
Fig. » » » yt 1 tig: 2—3: ) 
Syn. Fucus saccharinus Pall. Reise, 3, p. 34. 
» » ScorgsBy, Account 1, p. 132. 
Laminaria Agardhii Kye.im. Spetsb. Thall. 2, p. 18; Algenv. Murm. Meer. p. 37; Kariska hafvets 
algv. p. 24. 
» caperata J. G. Ac. Spetsb.. Alg. Bidr. p. 5 et 11; Till. p. 28. 
» » Gost, Algenfl. Weiss. Meer. p. 76. 
» » Kyetim. Vinteralgv. p. 64. 
“» longicruris J. G. Ac. Spetsb. Alg. Progr. p. 2; Bidr. p. 11. 
» ophiura Linpsu. Bot. Not. p. 157. 
» phyllitis Nyl. et Sel. Herb. Fenn. p. 73 (). 
» » Post. et Rupr. Ill. Alg. p. II (?). 
» » ZELLER, Zweite d. Polarf. p. 84 (?). 
» saccharina (?) J. G. Ac. Spetsb. Alg. Progr. p. 2; Bidr. p. 11. 
» » Eaton, List. p- 44. 
» » Post. et Rupr. Ill. Alg. p. II (?). 
» » Scurenk, Ural Reise, p. 546. 
» » Wirrtr. in Heugl. Reise, p. 284. 
Ulva latissima Marin, Met. Observ. p. 313. 7) 
Remark on the species. It should be added here to the description of this species 
given by J. G. Acarpn and by myself, that it differs in the structure of the lamina 
from L. saccharina, from which certain forms of it are only with great difficulty to be 
distinguished by outward marks. I have examined a great many specimens from diffe- 
rent localities, at different seasons, and in different stages of development, but I have 
never been able to detect any muciferous canals in the lamina. Thus I believe I may 
gay that in the alga called by J. G. AcGarpu ZL. caperata, which name I have thought 
fit for reasons already stated to replace by L. Agardhii, muciferous canals either are 
wanting in the lamina, or, if they really exist there, are very difficult to detect, and at 
least different in position, shape and size from the same organs in Scandinavian L. 
saccharina. I ought to point out however that it has been stated by Le Joris who 
has made the structure of the Laminariacew the subject of accurate investigations, that 
the lacunee mucifere (»canales muciferi») in the lamina of LZ. saccharina are very small 
— »tres petits» — and that »leur extréme petitesse par rapport aux énormes cellules 
irrégulicres, qui constituent le tissu de la fronde, les rend tres difficiles a apercevoir». 
(Le Jor. Exam. p. 548), which observations do not at all accord with the results of 
my own researches on Scandinavian L. saccharina. In all the ZL. saccharina from our 
coasts that I have examined, I have found these cavities large, very distinct, and often 
confined in a greater or less part of their circumference by cells differing in shape and 
*) The species is also recorded at Spitzbergen by Marrens, by whom it is described and figured. See Mar- 
TENS, Voyage Spitzb. p. 79, tab. J, fig. C. 
