ARCHER, ON PALMOGL@A MACROCOCCA. 129 
what place amongst the algze near them they may be even- 
tually thought to hold, they appear to me, at least, very well 
distinguished as genera and species. 
Reverting now to the description of our plant given above, 
I would just compare it with that of De Bary’s M. chlamydo- 
sporum. It will be seen that our plant disagrees with that 
alluded to, in that it seems to possess a more dense and more 
coarsely granular endochrome—that during division the 
parent-membrane does not seem to be cast off as a free pelli- 
cle, cap-like, from the ends of the old cells—that the zygo- 
spore is ovate, not quadrate—that it becomes surrounded by 
a definitely bounded mucous investment, and that, prelimi- 
nary to the process of conjugation, the parent-cell-membrane 
is cast off (figs. 8 to 14). On the other hand, it agrees in 
the general form and dimensions of the cell, which in both 
are cylindrical with rounded ends, in the form of the chloro-. 
phyll-plate, and in the ultimate contraction’ of the contents 
of the zygospore within the primary external coat, and the 
formation of a new one of an angular figure closely investing 
the inner actual spore (figs. 15 to 19). This latter process 
does not take place for some time after conjugation and the 
formation of the external coat; hence I at first rather too 
hastily assumed that it did not occur in our plant. How- 
ever, I have met with numerous specimens presenting this 
character, which is, perhaps, sufficient to establish the specific 
identity of the plants in question. This plant, then, seems 
to be most likely the Palmoglea macrococca (Kiitz.). 
Perhaps it may not be unworthy mentioning, in case these 
forms may occupy the attention of observers elsewhere, that 
the only character which occasions doubt to myself as to the 
identity of the plant which occurs here, and which I conceive 
to be M. Brauniti (De Bary), Braun’s plant referred to in his 
‘Rejuvenescence’ is that of the colour of the mass. De 
Bary describes it as dark green, and he afterwards speaks of 
the special definitely bounded gelatinous investments of the 
cells present before the whole mass becomes seemingly con- 
fluent into a homogeneous mucus, as being of an intense, 
often dark, gray-violet colour. Now, my plant is of a red- 
dish-brownish hue in the mass, somewhat like that of an in- 
fusion of tea, but deeper and richer; the tint is deeper at 
the outside of the mass, and the colour is due to that of the 
gelatinous matter, and not to the cells themselves; but the 
form, structure, and appearance of the latter, under the 
microscope, seem, so far as I can judge, entirely to coincide 
with De Bary’s figures and descriptions of his M. Brauniz. 
I now proceed to describe, as best I can, a form I consider - 
