206 CUBAN SEAWEEDS. 
of the genus is U. flabellata (Fig. 53, 4 natural size), where the 
stem is formed of filaments surrounded by a calcareous coating, 
but, as soon as these filaments reach the expanded part of the 
frond, they divide indefinitely into root-like branches, the ends of 
which are placed, as in Halimeda, to form the surface. It is the 
misfortune of the genus Udotea, that very few of the species con- 
form to the type, and it is to be feared that plants, having an 
external, but not a microscopic, resemblance, have been huddled 
together into this very convenient, but not well defined genus. 
U. conglutinata seems to me nearly related to Penicillus of an- 
Fig. 57. 
Fig. 56. 
Acetabularia crenulata, nat. size. 
P, 
oo nat. nang 
other order. Amongst Mr. Wright’s plants was what appears t0 
me a new species, nearly related to U. flabellata, but having = 
much longer stipe, and the filaments in the stipe branching 4 well 
at the upper part. 
The genus Codium strongly resembles a single joint of aH 
meda, except that it has no calcareous covering, but is of about 
the same texture as the sponge. It consists of unicellular fila- 
filaments: 
grow large, obovate cells, which, lying side by side, form the sui 
; ; i ` - + ome species: 
face of the frond. From the sides of these cells, in some SP€ 
* and after- 
— st 
— 
ali- 
ments forming an intricate mass, from the side of which 
smaller cells are evolved and in them the sporangium 
*Spore-case, with spores produced in the centre. 
