168 KJELLMAN, THE ALGJE OF THE ARCTIC SEA. 



Hahitat. On exposed coasts this alga is litoral, growing scattered on rocks and 

 stones, above low-water mark, or more usually in rock-pools between tide-raarks. In 

 the interiör of Alten Bay it was found in the npper part of the sublitoral zone at a 

 depth of about one naetre. It has been found with tetrasporangia on the coast of the 

 Norwegian Polar Sea in June and August. 



Geogr. Distrib. Known only from the Atlantic region of the Polar Sea, in the 

 Southern part of which it is commonly distributed. The northerinnost place where it 

 has been met with is Gjesvaar on the north coast of Norway, about Lat. N. 71 . 



Localities: The Norioegian Polar Sea: Nordlanden, coramon and plentiful; Fin- 

 marken, pretty common, but not plentiful, as at Maasö, Gjesva-r, Oxfiord, and Talvik. 



Fam. CERAMIACEiE (Ag.) Hauck. 



Meeresalg. p. 15. Ag. Syst. Alg. p. XXVIII; char. mut. 



Gen. Microcladia Grey. 



Alg. Brit. p. 99. 



Microcladia glandulosa (Soland.) Grev. 



1. c. Fucus glandulosus Soland. ia Turn. Hist. Puc. 1, p. 81. 

 Descr. Microcladia glandulosa J. G. Ag. Epicr. p. 109. 

 Fig. » » Harv. Phyc. Brit. t. 29. 



Addition to the description of tids species. The figures of the structure of the plant 

 given by Harvey 1. c. are very unsatisfactory. The corresponding figure in Kutzing's 

 Tab. Phyc. 13, t. 21 is better. This seems to represent a transverse section of some 

 younger portion of the plant. In transverse sections of older portions I have found 

 the central cell as well as the large cells of the parenchyma much more thick-walled, the 

 latter cells being moreover surrounded with more or less numerous small cells, which 

 are rich in endochrome. The Scandinavian specimen of the species that I have seen 

 was furnished with tetrasporangia. These were cruciate, lying without order as stated 

 by J. G. Agardh 1. c, numerous in the outermost or next to outermost segment. The 

 iirst tetrasporangia are formed at the external margin of the segment, but afterwiirds 

 new ones are produced within these, until the whole surface of the segment is occupied. 



Hahitat. I have seen a single individual of this species, Avhich is new to the Flora 

 of Scandinavia. It had been brought home from Nordlanden by Kleen, but had been 

 overlooked by him. It was found amongst a great number of Plocamiiim coccineurn. 

 If it had really grown together with these, as is possibly the case, the present species 

 W'Ould occur on exposed coasts in deep water on stony or shelly bottom. The spe- 

 cimen had been taken in sununer. 



Locality: The Norwegian Polar Sea: Nordlanden, without any note of its special 

 locality. 



