130 KJELLMAN, THE ALGA 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. 
r 
Chantransia virgatula (Harv.) Tour. 
in Le Jol. List. Alg. Cherb. p. 106. Callithamnion virgatulum Harv. in Hook. Brit. Fl. 2, p. 349. 
f. Farlowiti nob. 
Descr. Trentepohlia virgatula Fart. New Engl. Alg. p. 109. 
Fig. »— » » t. 10. fig. 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 Fartow virgatula Harv. and 
figured |. c., while the other coincides with that which ArEscuouc has distributed in 
his work of exsiccate under the name of Trentepohlia secundata Lyncs. FARLOw quotes 
Trentepohlia virgatula Harv. Phye. Brit. pl. 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 Fartow 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 alga by one and the same name. However, it is possible 
that Ch. virgatula varies much, and that the plant figured by Fartow 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 litoral 
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: Tromsé and Oxfjord, very rare at both 
places. 
Chantransia secundata (Lynes.) THur. 
in Le Jol. List. Alg. Cherb. p. 106. Callithamnion Daviesii @ secundatum Lynes. Hydr. Dan. p. 129. 
Evsice. Trentepohlia secundata Arrscn. Alg. Seand. exsiec. N:o 84. 
Syn. Chantransia secundata Ksetim. Algenv. Murm. Meer. p. 15. 
» » Kieren, Nordl. Alg. p. 16. 
