150 



Habitat. The present plant lives in the upper as well as- 

 lower part of the sublitoral region, fastened to smaller stones or 

 to shells, sometimes on a depth of 2 — 4 fathom sometimes and 

 more frequently on greater depths, until 15 fathom, or occasionally 

 more. It appears to prefer protected places and descends deepest 

 in exposed localities. It often grows together with other Litho- 

 thamnia, in such cases frequently at length being covered with the 

 latter. Specimens collected in July to October were provided with, 

 ripe sporangia, in August and September with carpospores and 

 spermatia. 



Occurrence. It is probably more commonly dispersed along 

 the northern and western part of the coast than hitherto known,, 

 in several places being pretty plentiful. I have taken it at Kjelmo, 

 Kirkenes and Mehavn in East-Finmarken ; Kistrand, Kjelvik, Kval- 

 sund, Sopnes (Altenfjord) in West-Finmarken ; Skorpen, the outer 

 part of Balsfjord and at Mestervik in Tromso Amt. I also met 

 with it at Strommen, Ytteroen, Tautra, Oxningen, Munkholmen,. 

 Vanvik, Roberg and Rissen in the Trondhjem Fjord. One or two 

 small specimens have been gathered at Sulen in Sogn (Boye) and 

 Espevaer (Gran) on the south-western coast. 



Geogr. Distribution. The White Sea (Gobi); Spitzbergen ;. 

 Greenland (Rosenvinge); Iceland (St romfelt)? The Atlantic coast 

 of North America (Farlow)? 



Subgen. Lithophylium (Phil.) Fosl. mscr. 1 ) 



Gen. Lithophylium Phil. 1. c. ; Aresch. 1. c. ; Rosan 1. c. 



Lithothamnion Lenormandi (Aresch.) Fosl. mscr. 



Melobesia Lenormandi Aresch. 1. c. 



Descr. Lithophylium Lenormandi Rosan. 1. c. p. 85. 



Fig. „ ,, „ „ t. 5, fig. 16—17, t. 6, fig. 1— 3 



Hauck, Meeresalg. t. Ill, fig. 4 - 

 Stromf. Algveg. Isl. t. 1, fig. 9—10. 



!) After a part of the present paper was printed I have had the opportunity 

 to see a note by Mr. P. Hariot in Journ. Bot. 9, p. 113, where he pro- 

 poses to change the name Lithophylium Phil, for Tenarea Bory. He 



