216 MISS SARAH M. BAKER ON THE 
disappeared on the lower levels of the marshes, and its place was taken by 
an association in which Aster Tripolium predominated, but Suæda maritima, 
Salicornia europea, and Statice Limonium were also present. 
The alow were associated with the phanerogams in a very striking manner. 
Round the Salicornia was a closely-knit network of an unattached form of 
Pelvetia canaliculata (seen at а, Pl. 8. fig. 1). This formed a continuous 
covering to the ground, and through it the phanerogams grew up. But as 
the Salicornia association gave place to the Ister association, the occurrence 
of Pelvetia became less frequent, and in its place a small spiral Fucus was 
Гіб. 1. 
Feviting Ps аван 
Salicomma P * ES N 
Aster Е = EA + 
|: 100 200 300 Scale un Tt. 
Sketch-map of part of the marshes at Blakeney Point, Norfolk. The creeks are represented 
е р _ г › "E ~ . К ~ . " . | | v 
in black. The Pelvetia-Salicornia association is shown by line-shading, the Fucus- 
Aster association by dotted shading. ' > of fruiti elvetia i Ў | 
HM ading. The zone of fruiting Pelvetia is shown by a heavy 
кеп іше. Lhe left-hand third of the area charted forms the subject of Pl. 8. fig. 1 
| . 8. fig. 1. 
found embedded in the mud, the Fucus appearing first along the banks of the 
creeks. Irregular shaped patches of a smaller form of Fucus were also found 
among the Salicornias in the Pelvetia zone, but the Salicornia was much 
smaller when growing with Fucus than Pelvetia. Та the sketch-map 
(text-fig. 1) the general distribution of the two associations is shown. The 
Salicornia-Pelvetia association is represented by means of line-shading the 
Aster-Fucus association by dots. 7 
rn M 
The algw to be described are two forms of Pelvetia canaliculata—one 
growing entirely without attachment among the halophytes ; the other 
