110 DR. Е. BORGESEN ON FUCUS SPIRALIS, LINNÉ. 
* Several Færüese examples are shown in fig. 97, the small ones being forma 
nana, the large f. typica. This species occurs in the littoral zone along the 
Færôes, and grows in fairly sheltered situations (especially forma typica) as 
well as on exposed coasts (forma папа). In more particularly exposed places 
the latter may be found growing at а considerable height above high-water 
mark, е. g., at Vaags Ejde it occurred at a height of some 5 metres. И 
grows by preference on steeply inclined cliffs which are incessantly dashed 
by the sea in rough weather. On the other hand, in calm weather it often 
suffers from desiccation, and I have frequently gathered it so dried that it 
could easily be broken. It always grows gregariously, and this applies 
especially to forma папа. It has also sometimes been found in rock-pools at 
high levels, e. g., in abundance near Velbestad, speeimens from such situations 
being thinner and of slenderer build, answering to Ё. linearis of Fucus inflatus, 
as Ё, nana answers to f. disticha. 
* Fruetifying plants were found in April, May, June, July, and October. 
A few specimens gathered in December were sterile. Its period of fructifica- 
tion eorresponds exactly to that of plants in the Norwegian Polar Sea where, 
according to Kjellman 7. c., they bear receptacles during summer and a part 
of October." 
Now Prof. Sauvageau thinks that the name of this plant ought to be Fucus 
platycarpus, Thur., with var. spiralis., Sauv. ; while оп the contrary I have 
called it, and still maintain it ought to be called, Fucus spiralis, L., with var. 
platycarpa (Thur.) Bórgs. 
The question at issue is now : Is Linné’s description of Fucus spiralis such 
as would make it quite certain what plant it is applied to? 
In ‘Species Plantarum,’ tom. ii. p. 1159, Holmise 1753, Linné gives the 
following diagnosis :—“ Fucus spiralis. Fucus fronde dichotoma integra, 
caule folium percurrente: inferne nudo, vesiculis verrucosis terminalibus. 
Fl. lapp. 467. ЕІ. suec. 1003. Roy. lugdb. 514. 
“ Fucus spiralis maritimus major, Raj. angl. 3. p. 41. 
* Habitat in Oceano." 
The diagnosis itself is short, and, but for a single less essential exception, 
literally like that of Fucus vesiculosus, but if the species-name is to be 
considered, the charaeteristie twisting of this plant is justly pointed out. 
However, it is not to be forgotten that Linné, with regard to the diagnosis 
of Fucus vesiculosus, adds: “ Fucus marinus f. Quercus maritima vesiculas 
habens.” * 
* Prof. Sauvageau does not mention this, and when he on p. 7 writes:;—* Il n'est méme 
pas certain que le nom spécifique soit plus expressif que la diagnose, car Linné appelle les 
réceptacles vésicules, et tous les Fucus mériteraient le méme qualificatif de vesiculosus,” it is 
not quite correct, as Linné calls the receptacles “ vesiculæ verrucose,” but the vesicles only 
* vesiculæ.” 
