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 13 The 
specimen in question had another peculiarity: a longer or shorter 
Fig. 63. Rhodochorton Rothii (Turt.) Nag'. Creeping filament 
with the basal part of the erect filaments. On 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.) 
Nag'. On Laminaria, a. Erect fila¬ 
ments with terminal sporangia (the 
dots indicate that a longer portion of 
the filament has been omitted). 110 :1. 
b. Another filament of the same plant 
to show clusters of tetrasporangia. 
90 : 1. 
portion of the filaments was often near the base encircled by other 
cell-filaments which formed a dense, cortical sheath around the 
central filament (see fig. 65), out of which numerous free filaments 
grew up. I have not had an opportunity of watching the process 
by which this sheath is formed. 
As indicated above, on the Fseroese coasts this alga is very 
common in the littoral zone. How far above sea-level it can grow 
