118 KJELLMAN, THE ALG OF THE ARCTIC SEA. 
Polysiphonia urceolata (Licutr.) Grev. 
F]. Edinb. p. 309. Conferva urceolata Ligurr. in Dillw. Intr. p. 82. 
f. typica. 
Descr, Polysiphonia urceolata @ urceolata J. G. AG. Spee. Alg. 2, p. 970. 
Fig. » » Harv. Phyc. Brit. t. 167. 
Eesice. oil » Aruscu. Alg. Scand. exsice. N:r 68. 
f. roseola Ac. (J. G. AG.) 
l. c. p. 971; Hutchinsia roseola Ac. Spec. Alg. 2, p. 92. 
Descr. Polysiphonia urceolata ¢ roseola J. G. Ac. 1. e. 
Fig. » formosa Harv. Phyc. Brit. t. 168. ; 
EHesice, » roseola Argscu. Alg. Scand. exsice. N:o 69. 
Syn. Conferva stricta We. FL Lapp. p. 512. 
Polysiphonia pulvinata Gost, Algenfl. Weiss. Meer. p. 25, excel. syn. 
» roseola Post. et Rupr. IL. Alg. p. Il, see. Goi, 1. e. 
» » Nyl. et Sel. Herb. Fenn. p. 74. 
» urceolata Croat, Fl. Dise. p. 459; ex parte. 
» » Dickiz, Alg. Sutherl. 2, p. 191. 
» » Gost, Algenfl. Weiss. Meer, d. 26. 
"» » Kieren, Nordl. Alg. p. 13. 
Remark. on the definition of the form. According to my experience, there are to 
be found in the Polar Sea only two forms of this species, of which the one is identical 
with that distributed by ArgescuouG in Alg. Scand. exsice. N:o 68 under the name of P. 
urceolata, the other with the plant called P. roseola. Kuren mentions certainly that there 
occur in the Norwegian Polar Sea two other forms, f. patens and f. formosa, but there 
are not, in the collections rich in specimens of P. wrceolata which he has brought home 
from there, to be found any specimens that I think can be referred to the varieties 
so called. Some specimens show indeed differences from one another, but these are 
not so distinctly marked as to make it possible to draw any definite limit. There are 
some specimens differing in many respects from the typical P. urceolata, but the pe- 
culiar development of these ought rather to be regarded as a monstrosity than as a 
difference of type. These are densely tufted, more robust than the typical specimens; 
the upper main branches carry dense, corymbose clusters of branches, whose secondary 
branches are short, robust, curved backwards or angularly, closely compact and con- 
nected with one another by peculiar fastening-organs. These are sometimes longer 
sometimes shorter, hyaline, unicellular, with very thick walls, and terminate in a 
fastening-disk with crenate margin. 
Remark on the synonymy. 1 have referred to P. urceolata the plant recorded by 
Gost in his Algenflora des weissen Meeres under the name of P. pulvinata J. G. AG. 
Spee. Alg. p. 957 and Arescu. Alg. Scand. Exsicc. N:o 67. J. G. AGarpu 1. ¢. has 
already identified the plant called by him P. pulvinata Ac. with that mentioned by 
AruscHoua in Phye. Scand. p. 270—280 under the name of P. pulvinata Roru, and I 
suppose it is in consequence of this that this plant is stated to grow in Sinus Codanus. 
