THE BROWN SEAWEEDS OF THE SALT MARSH. 337 
The Marsh Fuci of France and Spain. 
There stil remains the question of the continental Fuci. Sauvageau 
(1908) has published an exceedingly valuable and elaborate study of two 
marsh Fuci, which he refers to F. lutarius, Kütz. The first of these two 
Fuci, the type F. lutarius, is morphologically identical with the medium- 
sized Blackwater forms, growing in rather dilute sea-water ; but Sauvageau 
considers them as a distinct species, having affinities rather with F. spiralis, 
ог with his recently described new species the hermaphrodite №. dichotomus 
(Sauvagean, 1915, p. 14), than with Л. vesiculosus. This is for two reasons : 
first, because the Fucus never bears vesicles in that locality; and, secondly, 
because the receptacles are always female, and hence possibly reduced from 
hermaphrodite receptacles. 
The second argument is obviously the more important ; but it rests upon 
an assumption, which does not seem to be warranted by experience, the 
assumption that marsh conditions would tend to reduce a hermaphrodite 
conceptacle to a female one. There are certain hermaphrodite Fucoids 
which occasionally fruit upon the salt marsh :— Pelvetia canaliculata 
v. libera, F. spiralis у. nana, and lastly, F. ceranoides. 
In every case the marsh form produces hermaphrodite, not female recep- 
tacles. In Pelvetia and F. spiralis they are normal, but in F. ceranoides we 
get the interesting evidence that marsh conditions have interfered with the 
normal reproductive economy of the plant, but with reduction of both the male 
and female constituents of the hermaphrodite plant, in different individuals. 
There seems, in none of these cases, to be any tendency for the survival of 
the female element of the hermaphrodite individual rather than the male. 
For these reasons we consider №. lutarius as monœcious and probably 
referable to F. vesiculosus, together with the plant bearing vesicles, reported 
by Sauvageau from St. Vicomte de la Barquera in Spain. The variety 
arcassonensis of F. lutarius has much resemblance to the F. baltieus from 
Clew Bay, already referred to F. vesiculosus, although it is considerably 
broader and larger in form, and the underground attachment by a bunch of 
rhizoids is unique. Probably it is to be grouped among the small turf-like 
marsh forms of F. vesiculosus ; but without fertile plants or definite inter- 
mediate forms it is impossible to judge certainly. 
American Salt-Marsh Fuci. 
Certain Fuci from American salt marshes have been distributed by 
Collins in the * Phycotheca Boreali-Americana.' Of these, the F. vesiculosus, 
v. spiralis, Farlow, which occurs with Spartina т muddy salt marshes 
(Johnson & York, 1915), is identical with an ordinary spiral v. volubilis of 
F. vesiculosus, such as is found at Hurst Castle with Spartina. The other 
