THE BROWN SEAWEEDS OF THE SALT MARSH. 343 
The second form was a typical marsh variety. It was much dwarfed, 
only about half or a quarter the size of a normal plant, and grew embedded 
but unattached in the upper zones of the marsh with Heleocharis. The plants 
were much curled and interwoven, and vegetative budding was prevalent 
along the buried part of the thallus. In April this budding was so extensive 
that the habit of the parent plants was masked by it. The plant was at 
once distinguishable from Fucus vesiculosus v. volubilis by (a) the absence of 
marked spirality, (b) the great delicacy of the thallus, (с) the arrangement 
of the eryptostomata, which were never marginal, but were often arranged 
in two rows, one on either side of the midrib, The arrangement of the 
Ета. 10.— Fucus ceranoides megecad limicola. Nat. size. 
Embedded with Heleocharis, upper zone. MKeyhaven, Hants. 
receptacles was also on a miniature scale, the same as that of Fucus 
ceranoides, L. ; tiny receptacles about the size of a hemp seed being arranged 
in lateral corymbs around a relatively broad central axis (see figs. 9, 10, 
¢ 11). Occasionally this form occurred loose among the Scirpus, 
The Receptacles of the Marsh Fucus ceranoides. 
The most interesting point about these marsh forms is their reproductive 
organs, The Fucus ceranoides found growing on sea-walls or embedded 
pebbles at Keyhaven was uniformly hermaphrodite, the oogonia were 
2,9 
2p9 
