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 hes north of the Atlantic. Its northernmost point is Fairhaven on 
the northwest coast of Spitzbergen, Lat. N. 79° 49’. 
Localities: The Norwegian Polar Sea: Finmarken local and scarce at Maasé. 
The Greenland Sea: the north-west coast of Spitzbergen, rare. 
The Murman Sea: the west coast of Novaya Zemlya, washed ashore at Matot- 
shin Shar. 
Cladophora Glaucescens (Grirr.) Harv. 
Phye. Brit. t. 196. Conferva glaucescens Grirr. in Harv. Man. p. 139. 
Descr. Cladophora glaucescens Hany. Phyc. Brit. |. ec. 
Fig. yt » Kutz. Tab. Phye. 4, t. 24. 
Syn. Cladophora sericea Kleen, Nord]. Alg. p. 45. 
Conferva glomerata # marina We. FI. 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. However 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 litoral, 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 which 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. Distrib. This species is known only from the north-west and north coast 
of Norway. Its most northern point is Gjesver about Lat. N. 71°. 
Localities: The Norwegian Polar Sea: Nordlanden according to numerous speci- 
mens in Kreen’s herbarium; Finmarken, abundant at Gjesver and Talvik. 
Cladophora Gracilis (Grirr.) Harv. 
Phyc. Brit. t. 18. Conferva gracilis Grirr. sec. Harv. 1. ce. 
Descr. Cladophora gracilis Fart. New Engl. Alg. p. 55. 
» » Harv. 1. ec. 
Fig. » » Kurz Tab. Phyc. 4, t. 23. 
» vadorum » » > Ants 20: 
Syn. Cladophora gracilis Kuemn, Nordl. Alg. p. 45. 
