DR. F. BÜRGESEN ON FUCUS SPIRALIS, LINNÉ. 117 
To the latter he refers the alga distributed as Fucus platycarpus т Alg. Scand. 
No. 54, but he points out that on further reflection he considers them to be 
different species, on account of the ramifieation of Thuret's plant. Areschoug 
quotes as synonym of Fucus Sherardi var. spiralis, Fucus spiralis, L., and 
adds as an explanation as to why he uses Stackhouse's name, instead of that 
of Linné, that the latter has reference to changes due to casual or local con- 
ditions *. This proceeding is of course quite unjustifiable, even if it really 
should be the case. We also notice that Kjellman, in ‘The Algæ of the 
Arctic Sea,’ p. 202, consequently uses Linné's name, “ Fucus spiralis, L., 
Spec. Plant. 2. p. 1159, sec Aresch. Кие. et Pyenoph. p. 106,” and further- 
more enumerates : 
“Deser. Fucus Sherardi a spiralis, Aresch. 1. c. 
Fig. — — spiralis, Fl. Dan. t. 286 : non bona. 
Exsice. platycarpus, Aresch, Alg. Scand. exsice. No. 54." 
Fucus platycarpus of Thuret is not mentioned: this plant Kjellman, who 
liked small specific differences, sureiy considered as a species distinct from 
Areschoug’s plant ; and this view of his has been furthermore expressed in his 
‘Handbok i Skandinaviens Hafsalgflora, Stockholm 1890, p. 11, where he 
gives to the form of Areschoug the name of Fucus Areschougi T. 
In the same year as the ‘Handbok’ of Kjellman appeared, Foslie has in 
* Contribution to the Knowledge of the Marine Algæ of Norway: I. East- 
Finmarken ” (Tromsö Mus. Aarshefter, xiii. p. 66, 1890), Fucus spiralis, L., 
as a distinct species. 
То further mention a few examples from later days, Collins has in 1896 
(Bull. Torr. Dot. Club, vol. xxiii. p. 5) а Fucus Areschoug about which he 
says, that it is closely related to Fucus platycarpus : “there may be inter- 
mediate forms, but the types seem distinct, Fucus platycarpus being а larger 
plant, with broader frond, having the fruiting segments lateral" And in 
‘Preliminary Lists of New England Plants.— У. Marine Algæ ” (Rhodora, 
1900) Collins also has Fucus Areschougii, Kjellm., and Fucus platycarpus, Thur. 
Having already, in the introduetion of this paper, mentioned how this 
species is apprehended by De Toni (1895), I shall only further point out, that 
in the same year (1902) as my treatise appeared in “ Botany of the Færöes,” 
Batters has in ‘Catalogue of the British Marine Algae, p. 50, Fucus 
spiralis, Le (=Fucus Areschougü, Kjellm.) and var. platycarpa, Thur. 
(=Fucus platycarpus, Thur.), quite agreeing with me, but not giving any 
proofs of his point of view. 
* « Antyder endast tillfälliga eller lokala afvikelser." 
+ Kjellman’s reason for giving this plant the new name, Fucus Areschougii, was I think 
because he considered this form as specifically different from Fucus platycarpus, Thur., and 
furthermore he does not use Linné’s name because Linné’s plant, if 1 rightly understand his 
note, 1. с. p. 11, in his opinion only included the boreal form occurring on the shores ot 
Nordland and Finmarken. 
