260 KJELLMAN, THE ALG^ OF THE AECTIC SEA. 



conical, obtuse, issuing from a broad base, with free tips. They are usually simple, 

 sometimes branched, downward composed of two or more rows of cells, upward of 

 only one row. They form, together with the numerous paraphyses, an almost coherent 

 layer, which is not however so dense as in Sc. lomentarius nor surrounded, as in that 

 species, with a common tegument without distinct structure, a so called cuticula, which 

 is dissolved in the formation of zoospores (garnets). The paraphyses are large cells, 

 several times larger than the zoosporangia (garaetangia), nearly obovate, sometimes 

 almost club-shaped. They are always poor in endochrome, sometimes apparently alto- 

 gether destitute of it. In arrangement and number they vary in the present species as 

 in the preceding in different individuals and in different parts of the same individual, 

 being sometimes very few, sometimes very numerous. The present species is essentially 

 different from the preceding and easily distinguished from it by the shape of the frond 

 and, above all, by the shape, size, and disposition of the zoosporangia (gametangia). 



In my account of the marine Flora of Spitzbergen I have determined this plant 

 as Coilonena chordaria f. simpliciuscula. The specimens at my disposal were so badly 

 preserved that I failed to get a clear view of the structure. Seen from the surface, 

 the part provided with zoosporangia much resembles a Coilonema. The paraphyses appear 

 as void zoosporangia and the extremities of the zoosporangia as rounded cortical cells. 

 I interpreted my preparations in this manner. By a suitable treatment of some of the 

 least injured specimens I have since found that this interpretation was wrong and that 

 the present plant is plainly a Scytosiphon, though of another species than the common 

 Sc. lomentarius. 



Habitat. It grows on the upper part of the sublitoral zone, at a depth of 3 — 4 

 fathoms, attached to other algae, both on exposed and sheltered coasts. Specimens 

 taken in July on the east coast of Spitzbergen bear reproductive organs. 



Locality: The Greenland Sea: in Icefjord at Goose Isles and in Smeerenberg Bay. 



PUNCTARIACEiE (Thur.) Kjellm. 



PI. Scand. p. 9; Thur. in Le Jol. Liste Alg. Cherb. p. 14; lira. mut. 



Gen. Punctaria Grev. 



Alg. Brit. p. XLII. 



Punctaria plantaginea (Roth) Grev. 



1. c. p. 53. Ulva plantaginea Eoth. Cat. Bot. 3, p. 243. 



f. typica. 



Descr. Punctaria plantaginea J. G. Ag. Spec. Alg. 1, p. 73. 



Fig. » » Hart. Phyc. Brit. t. 128. 



Exsicc. » » Aresch. Alg. Scand. exsicc. N:o 170. 



