F. Børgesen: The Species of Sargassum. 



9 



Herbarium, and upon which Linné himself has written his determination. Of these 



I shall first mention the one (Fig. 3) which is much like Turner's figure, and quite 



agreeing with the material collected by myself. Regarding this specimen Mr. Daydon 



Jackson has given me the following information: 



"This specimen most resembles D. Turner's figure 



of Fucus bacciferus, Hist. Fucor,, t. 47; at the base of 



the specimen we can read "Indica", and at the 



bottom of the sheet "natans 11" both in Linné's 



handwriting; at the right hånd bottom corner oc- 



curs ''bacciferus D. T." the initials of course of Daw- 



soN Turner; above this some unknown man has 



written ''Sargassum'". 



As regards the next specimen, found in the 



Linnean Herbarium Mr. Daydon Jackson writes 



the following: "Linné has written "11 iO, \ na- 

 tans" evidently doubting what to call it. Dawson 



Turner has inscribed it as "bacciferus j3 D. T."; 



on the base of the sheet Linné has wTitten: "Fanns 



i Inds . . . sioen, men rar" [I am not sure of Inds 



— it is so badly written]," This specimen which 



Turner refers to his variety /9 about which he says 



"differs from « only in having its leaves oblong 



instead of li- 

 near, and two 

 Hnes wide" ap- 

 pears to me to 

 approach the 



pelagic form of S. Hystrix which will be de- 

 scribed later on. 



In respect to the third specimen finally Mr. 

 Daydon Jackson informs me that we find "11 

 natans" in Linné's handwriting and further "right 

 D. T." This specimen is not so well prepared, 

 more clotted, and it is therefore more difficult to 

 recognize from a photo but most probably it be- 

 longs to Sargassum natans as also determined by 

 Dawson Turner. 



From this it is clear that Linné's Herbarium 



2 



Fig. 6. Sargassum natans (L.). Inter- 



mediate form. Some of the vesicles 



with a short prolongation at their 



apex. (About Ve magnified). 



Fig. 7. Sargassum natans (L.) var. ciliata 



nov. var. Part of Thallus with vesicles. 



(About Ve magnified). 



