ON PROTOPLASMIC CONTINUITY IN THE FLORIDES. 67 | 
continuity does not disappear with age, but still obtains in the 
axial cells. It is equally persistent in the cortical cells, but the ~ 
details of this are not shown in the drawing. i 
Ptilota plumosa differs from P. elegans chiefly in the degree 
of cortication which it presents, even the youngest branchlets being 
provided with cortical. cells. As regards protoplasmic continuity, 
however, it agrees with the more elegant species, though this is a 
little more difficult to demonstrate. 
5. WorMsKIOLDIA AND DELESSERIA. 
The genera Wormskioldia and Delesseria, which, though sepa- 
d 
The best known of these is perhaps Wormskioldia sanguinea, 
formerly called Delesseria sanguinea, whose leaf-like frond is of a fine 
rose-red colour and is differentiated into a sort of petiole and 
lamina, with a midrib and lateral veins. Throughout these 
various portions of the frond protoplasmic continuity is exhibited 
in a distinct and unmistakable fashion. 
points the thickening is interrupted in such a way as to leave open 
channels of communication between cel land cell, along which run 
and several forms of D. alata have been examined, and all exhibit, 
without exception, phenomena of continuity in the main agreeing 
with those just described. 
6. Cuonprus, GiGARTINA, AND OysTocLoNiIum. 
general appearance of the frond is so well kno 
no description. Its structure is almost entirely cellular, the cells 
- being densest towards the surface of the frond, looser and slightly 
elongated in the direction of growth, towards the centre. The 
S 
~ made so by iodine solution, aniline blue, and other reagents. ‘They 
are extremely small masses of protoplasm, and strongly resemble, 
