308 KJELLMAN, THE ALG^ OF THE ARCTIC SEA. 



where else, but even here it is rare. It is not known at all beyond that part of the 



Polar Sea which lies north of the Atlantic. Its northernmost point is Fairhaven on 



the northwest coast of Spitzbergen, Lat. N. 79° 49'. 



Localities: The Xorwegian Polar Sea: Finmarken local and scarce at Maasft- 



The Greenland Sea: the north-west coast of Spitzbergen, rai'e. 



The Murman Sea: the west coast of Novaya Zemlya, washed ashore at Matot- 



shin Shar. 



Cladophora Glaucescens (Griff.) Harv. 



Phyc. Brit. t. 196. Conferva glaucescens Griff, in Haev. Man. p. 139. 



Descr. Cladophora glaucescens Harv. Phyc. Brit. 1. c. 

 Fig. » » KiJTZ Tab. Phyc. 4, t. 24. 



Syn. Cladophora sericea Kleen, Nordl. Alg. p. 45. 



Conferva glomerata ft marina Wg. PI. Lapp. p. 513. 



Remark on this species. The habit of the present species differs rather much at 

 different stages of development and at different places of growth. HoAvever it is al- 

 ways to recognized and distinguished from cognate species by its considerable size, its 

 comparatively short cells which are of about the same length in proportion to their 

 thickness in different parts of the frond, its straight branches that spring out at acute 

 angles and taper strongly towards the tip, and its long chains of sporangia (gametan- 

 gia) produced of strongly metamorphosized branches. 



Habitat. This species is literal, growing partly in such places as are left expo- 

 sed at low-tide, partly in rock-pools and other depressions in which there remains sea- 

 water even at that time. It is always attached at first to some object, usually small 

 stones, and when living in localities exposed to a heavy surge it remains fastened 

 during all its life. When on the contrary it occurs in quiet sheltered spots, especially 

 in water-pools with gravelly bottom — where it is often one foot or more in length — 

 it finally detaches itself from its substratum and afterwards forms masses of occasio- 

 nally most considerable size Avhich lie loose on the bottom or float on the surface. It 

 grows both on exposed and sheltered coasts and on the north coast of Norway it is 

 furnished with zoospores in July and August. 



Geogr. Distrih. This species is known only from the north-west and north coast 

 of Norway. Its most northern point is Gjesvser about Lat. N. 71°. 



Localities: The Norwegian Polar Sea: Nordlanden according to numerous speci- 

 mens in Kleen's herbarium; Finmarken, abundant at Gjesvser and Talvik. 



Cladophora Gracilis (Griff.) Harv. 



Phyc. Brit. t. 18. Conferva gracilis Griff, sec. Harv. 1. c. 

 Descr. Cladophora gracilis Farl. New Engl. Alg. p. 55. 



» " Harv. 1. c. 



Fig. » a KvTz Tab. Phyc. 4, t. 23. 



» vadorum » » » 4, t. 20. 



Syn. Cladophora gracilis Kleen, Nordl. Alg. p. 45. 



