KONGL. SV. VET. AKADEMIENS HANDLINGAU. BAND. 20. N:0 5. 169 



Gen. Oeramium (Lyngb.) Harv. 



Man. p. 98; Lyngb. Hydr. Dan. p. 117; spec. excl. 



Ceramium Deslongchampii Chauv. 

 Alg. Norm. N:o 85. 



Descr. Ceramium Deslongcliampii J. G. Ag. Bpicr. p. 97. 

 Fig. » » Harv. Pliyc. Brit. t. 219. 



Exsicc. » » Chauv. 1. c. 



Syn. Ceramium diaphanum Kleen, Nordl. Alg. p. 20; ex parte. 



Habitat. It grows scattered within the lower part of the litoral zone, attached to 

 other algse, both on exposed coasts and in the interior of bays. It bears tetrasporangia 

 in abundance during August on the north coast of Norway. 



Geogr. Distrib. It belongs exclusively to the Atlantic region of the Polar Sea, but 

 is rather uncommon. The northernmost place where it has been met with is Oxfjord 

 in Finraarken about Lat. N. 70°. 



Localities: The Norwegian Polar Sea: Nordlanden, according to specimens in 

 Kleen's herbarium ; Finraarken, at Oxfjord and Talvik, local and scarce. 



Ceramium circinatum KuTZ. 

 Hormoceras circinatum KiJTZ. Linntea p. 73.3. 



Descr. Ceramium circinatum J. G. Ag. Epior. p. 99. 

 Fig. » » KiJTZ. Tab. Pliyp. 12, t. 70. 



» decurrens » » » » » 71. 



Syn. Ceramium diaphanum Kleen, Nordl. Alg. p. 20; ex parte. 



Remark on the determination of this species. I have only seen two fragmentary 

 individuals of this plant from the Polar Sea. They are to be found in Kleen's collections 

 of algse from Nordlanden under the name of C. diaphanum. It cannot be denied that 

 they resemble this species in habit, but nevertheless they cannot be referred to it, on 

 account of the distinct, decurrent, cortical layer. Their habit and the shape of the upper 

 branches agree well with fig. a and b in the quoted plate 71 of KOtzing's Tab. Phyc. 

 12. Fig. d, tab. 70 of the same work shows the form and cortication of the lower 

 branches. These two plates referring, according to J. G. Agardh, to C. circinatum, I 

 have called the present alga from Nordlanden by that name. 



Habitat. Unknown to me. 



Geogr. Distrib. According to specimens in Kleen's herbarium this species occurs 

 in the southern part of the Norwegian Polar Sea at Nordlanden. 



99 



K. Vet. Akad. Handl. Band. 20. N:o 5. ^'^ 



