130 KJELLMAN, THE ALG^ OF THE ARCTIC SEA. 



Geogr. Distrib. It is known at present only from the Atlantic region of the Polar 

 Sea, and has its maximum of frequency in the southern part of this region. Its northern- 

 most locality is Oxfjord in Finmarken at the mouth of Altenfjord, about Lat. N. 70°. 



Localities: The Norwegian Polar Sea: Nordlanden, common and plentiful; Fin- 

 marken at Oxfjord, scarce. 



Chantransia virgatula (Harv.) Thur. 



in Le Jol. List. Alg. Oherb. p. 106. Callithamnion virgatulum Harv. in Hook. Brit. Fl. 2, p. 349. 



f. Farlowii nob. 

 Descr. Trentepohlia virgatula Farl. New Engl. Alg. p. 109. 

 Fig. » » » t. 10. flg. 3. 



Remark on the determination of the species. In the description of the marine spe- 

 cies of the genus Chantransia there prevails a great confusion. As almost every author 

 differs from the others in his views about the different species, the synonymy has be- 

 come entangled in the highest degree. In the Norwegian Polar Sea there are to be 

 found, besides the two species mentioned above, two other species of Chantransia, the 

 one of which is surely identical with that named by Farlow virgatula Harv. and 

 figured 1. c, while the other coincides with that which Areschoug has distributed in 

 his work of exsiccatas under the name of Trentepohlia secundata Lyngb. Farlow quotes 

 Trentepohlia virgatula Harv. Phyc. Brit. pi. 313 as being identical with his species. I 

 cannot but doubt his being fully justified in doing so, in case one may suppose that 

 the figures by Harvey and Farlow are both of them true to life. For the two figures 

 are very different from each other, so as to make the impression that the two authors 

 have meant specifically distinct algaj by one and the same name. However, it is possible 

 that Ch. virgatula varies much, and that the plant figured by Farlow is connected by 

 intermediate forms with the species originally described by Harvey under the name of 

 Callithamnion virgatulum. For the present I am obliged to assume this to be the case, 

 and I accordingly denote the plant in question by the above combination of names. 



Habitat. I have only succeeded to collect a very slight number of specimens of 

 this plant. These grew at sheltered places of the coast in rock-pools within the literal 

 zone, attached to Cladophora gracilis. Those collected in September were sporiferous. 



Geogr. Distrib. The present species is known only from the Atlantic region of 

 the Polar Sea. Its most northerly locality is the same as that of the preceding one, 

 viz. Oxfjord. 



Localities: The Norwegian Polar Sea: Tromso and Oxfjord, very rare at both 

 places. 



Chantransia secundata (Lyngb.) Thur. 



in Le Jol. List. Alg. Cherb. p. 106. Callithainnion Daviesii /? secundatum Lyngb. Hydr. Dan. p. 129. 

 Exsicc. Trentepohlia secundata Arhscii. Alg. Scand. exsicc. N:o 84. 



Syn. Chantransia secundata Kjellm. Algenv. Murra. Meer. p. 15. 

 » » Kleen, Nordl. Alg. p. 16. 



