1 18 KJELLMAN, TlIE ALGiE OF THE AKCTIC SEA. 



Polysiphonia urceolata (Lightf.) Grev. 



Fl. Ediiib. p. 309. Conferva urceolata Lightf. in Dillw. latr. p. 82. 



f". typica. 



Descr. Polysiphonia urceolata a urceolata J. G. Ag. Spec. Alg. 2, p. 970. 

 Fig. » » Harv. Phyc. Brit. t. 167. 



Exsicc. n » Akesch. Alg. Scand. exsicc. N:r 68. 



f. roseola Ag. (J. G. Ag.) 



1. c. p. 971; Llutchinsia roseola Ag. Spec. Alg. 2, p. 92. 

 Descr. Polysiphonia urceolata s roseola J. G. Ag. 1. c. 

 Fig. » formosa Haev. Phyc. Brit. t. 168. 



Esosicc. » roseola Aresgh. Alg. Scand. exsicc. N:o 69. 



Syn. Couferva stricta Wg. Fl. Lapp. p. 512. 



Polysiphonia pulvinata GoBi, Algenfl. Weiss. Meer. p. 26, excl. syn. 

 » roseola Post. et Rupe. II. Alg. p. II, sec. Gobi, 1. c. 



» » Nyl. et Stel. Herb. Fenn. p. 74. 



» urceolata Croall, Fl. Disc. p. 459; ex parte. 



» >> DiCKiE, Alg. Sutherl. 2, p. 191. 



» » Gobi, Algenfl. Weiss. Meer, d. 26. 



» « Kleen, Nordl. Alg. p. 13. 



Remark on the definition of the form. According to my experieiice, there are to 

 be found in the Polar Sea only two forms of this species, of which the one is identical 

 vvitli that distributed by Aeeschoug iii Alg. Scand. exsicc. N:o 68 under the narae of P. 

 urceolata, the other with the plant called P. roseola. Kleen mentions certainly that there 

 occur in the Norwegian Polar Sea two other forms, f. paténs and i. formosa, but there 

 are not, in the collections rich in specimens of P. urceolata which he has brouglit 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 dusters 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. I have referred to P. urceolata the plant recorded by 

 Gobi in his Algenflora des weissen Meeres under the name of P. pulvinata J. G. Ag. 

 Spec. Alg. p. 957 and Aresch. Alg. Scand. Exsicc. N:o 67. J. G. Agardh L c. has 

 already identified the plant called by him P. pulvinata Ag. with that mentioned by 

 Areschoug in Phyc. Scand. p. 270 — 280 under the name of P. irulvinata Roth, and I 

 suppose it is in consequence of this that this plant is stated to grow in Sinus Codanus. 



