342 DR, SARAH М. BAKER AND MISS М. Н. BOHLING ON 
means of sluice-gates. The gates do not prevent a considerable influx of 
salt water at high-tide, so that these reclaimed inarshes have the character 
of brackish-water marshes, the chief vegetation being :— 
Scirpus maritimus. Scirpus palustris. 
Triglochin maritimum. Heleocharis palustris. 
Arundo Phragmites. 
The normal attached Fucus ceranoides was abundant around the sea-walls 
and groins near to the sluice-gates; but on the marsh itself the same Fucus 
formed a dense undergrowth among the rushes, similar in appearance to the 
A 
В. 
Fig. 9.— Fucus ceranoides megecad limicola. Nat. size. 
Embedded with Heleocharis, lower zone: A, showing relics of attachment disc. 
Keyhaven, Hants. 
undergrowth of Fucus vesiculosus у. volubilis among Spartina Townsendii in 
the adjacent salt marshes. 
On examination the undergrowth proved to be composed of two distinct 
forms. The first was attached to the rhizomes of the larger rushes, Scirpus, 
Arundo, etc., usually below the ground. Its habit was identical with a much 
curled rock Fucus ceranoides, producing numerous adventitious shoots from 
the lower parts of the thallus (see fig. 8). 
