100 M. Fosiie. 



Syn. Fucus muscoides Gunn. 1. c. 2, p. 139. 



This species is, in general, sublitoral, but it occurs some- 

 times also in the litoral zone, in rock -pools, where I have 

 seen solitary specimens fastened to Fuci. It is most frequent 

 and best developed on a depth of 2 — 10 fathoms, chiefly on 

 open coast, and often gregarious in pretty large masses. 



Distribution: Common along the whole coast and at 

 many places abundant. 



Gen. Dichloria Grev. 

 Alg. Brit. p. XL. 



Dichloria viridis (Mull.) Grev. 

 1. c p. 39; Fueus viridis Mull. Fl. Dan. t. 886. 

 Descr. Dichloria J. G. Ag. Spec. Alg. 1, p. 164. 

 Fig. Desmarestia viridis Harv. Phye. Brit. p. 312. 

 „ „ Kiitz. Tab. Phyc. 9, t. 92. 



JExsicc. „ ,, Aresch. Alg. Scand. exsicc. .No. 88. 



Syn. Fueus viridis Wg. Fl. Lapp. p. 503. 



Gigartina viridis Lyngb. Hydr. Dan. p. 44. 



This plant is sublitoral, and it thrives best on open coast, 

 usually on a depth of 2 — 10 fathoms and a bottom formed 

 of pebbles, shells and Lithothamnia, descending to 15 fath- 

 oms or perhaps farther down. It is in general fastened to 

 smaller stones or to Lithothamnia, growing gregarious and 

 often in considerable masses. In a place in the neighbour- 

 hood of Tromso the plant is partly also litoral, forming a 

 broad belt from about 2 feet below to a little above extreme 

 low- water mark, and, consequently, uncovered at lowest spring 

 tides. Here it arises in May and disappears ir> October. I 

 do not know when it develops its reproductive organs. 



Distribution: Common along the whole coast and at 

 many places abundant. 



