RHODOPHYCE, OR FLORIDEE 217 
much-branched fertile filaments form the carpospores, 
either from their terminal cells only or from the upper 
cells as well. The whole of this complex is generally 
enclosed within a definite cystocarpic wall. 
Stenogramme, a small genus of wide distribution 
is represented on our shores by one somewhat rare 
Fig. 66.— Stenogramme interrupta. u, plant reduced; 6, carpogonium 
highly magnified. (b, after Johnson.) 
species, S. interrupta. Its fruits occur in a more or 
less continuous midrib-like line on the frond. This 
line increases in distinctness and becomes convex as 
the fruits form. When the fertile line of procarpia 
is ready for fertilisation, the superficial layers of 
thallus-cells increase in numbers and ultimately 
form the fruit wall, while the cells in the centre of 
the frond increase in size and richness of contents, 
