KONGL. SV. VET. AKADEMIENS HANDLINGAR. BAND. 20. N:0 5. 169 
Gen. Ceramium (Lynap.) Harv. 
Man. p. 98; Lynas. Hydr. Dan. p. 117; spec. exel. 
Ceramium Deslongchampii Cravuy. 
Alg. Norm. N:o 85. 
Descr. Ceramium Deslongchampii J. G. Ac. Epier. p. 97. 
Fig. » » Harv. Phyc. Brit. t. 219. 
Exsice. » » Cnavv. 1. ec. 
Syn. Ceramium diaphanum Kieren, Nordl. Alg. p. 20; ex parte. 
Habitat. It grows scattered within the lower part of the litoral zone, attached to 
other alge, 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 Finmarken about Lat. N. 70°. 
Localities: The Norwegian Polar Sea: Nordlanden, according to specimens in 
Krieen’s herbarium; lFinmarken, at Oxfjord and Talvik, local and scarce. 
Ceramium cirecinatum Kirz. 
» 
Hormoceras cirecinatum Kurz. Linnea p. 735. 
Deser, Ceramium circinatum J. G. AG. Epier. p. 99. 
Fig. » » Kitz. Tab. Phyc. 12, t. 70. 
» decurrens » » » eee a le 
Syn. Ceramium diaphanum Kieren, Nordl. Alg. p. 20; ex parte. 
Remark on the determination of this species. 1 have only seen two fragmentary 
individuals of this plant from the Polar Sea. They are to be found in Kirey’s collections 
of alge 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 6 in the quoted plate 71 of Kirzina’s Tab. Phye. 
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. AGarpn, to C. eircinatum, | 
have called the present alga from Nordlanden by that name. 
Habitat. Unknown to me. 
Geogr. Distrib. According to specimens in Kieen’s herbarium this species oceurs 
in the southern part of the Norwegian Polar Sea at Nordlanden. 
Ww 
to 
K. Vet. Akad. Handl. Band. 20. N:o 5. 
