395 



tetrasporangia were much longer and richly branched, and the 

 cells, excepting those in the basal part, were 3 — 4 times as long 

 as broad. The breadth of the filaments averages about 13ju. The 

 specimen in question had another peculiarity: a longer or shorter 



Fig. 63. Rhodochorton Rotliii (Turt.) Nag. Creeping filament 



with the basal part of the erect filaments, fln Laminaria 



hyperborea. 130 : 1. 



Fig. 65. Rhodochorton Rothii (Turt.) Nag. Portion of the filament 

 overgrown with other filaments. 160:1. 



Fig. 64. Rhodochorton Rothii (Turt. 

 Någ. On Laminaria. a. Erect fila- 

 ments with terminal sporangia itne 

 dots indicate that a longer portion of 

 the filament has been omltted). 110: 1. 

 b. Another filament of the same plant 

 to show clusters of tetrasporangiå. 

 DO : 1 . 



portion of the filaments was often near the base encireled by other 

 cell-filaments which formed a dense, eortical sheath aronnd the 

 central filament (see fig. 65), out of which numerous free filaments 

 grew up. I have not had an opportun itv of watching the process 

 by which this sheath is formed. 



As indicated above, on the Færoese coasts this alga is very 

 common in the littoral zohc How far above sea-level it can grow 



