168 KJELLMAN, THE ALG OF THE ARCTIC SEA. 
Habitat. 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-marks. In 
the interior of Alten Bay it was found in the upper part of the sublitoral zone at a 
depth of about one metre. 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 northernmost place where it 
has been met with is Gjesver on the north coast of Norway, about Lat. N. 71. 
Localities: The Norwegian Polar Sea: Nordlanden, common and plentiful; Fin- 
marken, pretty common, but not plentiful, as at Maasé, Gjesver, Oxfjord, and Talvik. 
Fam. CERAMIACE (Ac.) Hauck. 
Meeresalg. p. 15. Ac. Syst. Alg. p. XXVIII; char. mut. 
Gen. Microcladia Grey. 
Alg. Brit. p. 99. 
Microcladia glandulosa (Soranp.) GRrev. 
]. c. Fucus glandulosus SoLanp. in Turn. Hist. Fue. 1, p. 81. 
Descr. Microcladia glandulosa J. G. Ac. Epicr. p. 109. 
Tig. » » Harv. Phye. Brit. t. 29. 
Addition to the description of this species. The figures of the structure of the plant 
given by Harvey 1. c. are very unsatisfactory. The corresponding figure in Ktrzine’s 
Tab. Phyc. 138, 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. AGarpu |. ¢., numerous in the outermost or next to outermost segment. The 
first tetrasporangia are formed at the external margin of the segment, but afterwards 
new ones are produced within these, until the whole surface of the segment is occupied. 
Hvbitat. I have seen a single individual of this species, which is new to the Flora 
of Scandinavia. It had been brought home from Nordlanden by Kuen, but had been 
overlooked by him. It was found amongst a great number of Plocamium coccineum. 
If it had really grown together with these, as is possibly the case, the present species 
would occur on exposed coasts in deep water on stony or shelly bottom. The spe- 
cimen had been taken in summer. 
Locality: The Norwegian Polar Sea: Nordlanden, without any note of its special 
locality. 
