IN VEGETABLE BIOLOGY. 373 
the next figure is that of a young zoosporangium whose stalk 
alone is studded with particles. 
In additiou to the Palmella state there are two other vegetative 
modifications, both of which came under notice during the cold 
weather of the beginning of November. The first, represented in 
figs. 23 and 24, Pl. LVL, consists of groups of very small green 
cells surrounded by a common wall, the whole lying embedded in 
gelatinous matter. Fig. 24 shows a state of things not far removed 
from that of fig. 17, only here the two gonidia have secreted a 
wall, and their protoplasm has divided without any increase of its 
quantity supervening ; the letter x of fig. 23 points to two gonidia 
which have not undergone division. Such forms as these are 
known to systematists as the genus Glwocystis. Fig. 22 shows, 
besides undivided cells (x) and cells undergoing simple division 
(y), as well as a single Gleocystis group (g), small mulberry 
masses (5) surrounded by a common envelope ; and these agree 
in all essentials with the genus Botryocystis of algologists. 
To recapitulate the facts of this vegetable polymorphism. We 
have :— 
I. Escape of zoospores as originally described by Naegeli—all of 
them swarming together within the zoosporangium, and escaping 
by an aperture in its wall. 
II. Gradual emptying of the zoosporangium by the above 
method. 
III. Gelatinization of the whole wall and escape of the zoo- 
spores from any point. 
IV. Passage of coenobia with a definite wall into the zoosporan- 
gium; this may be compared with I. and II. 
V. Coenobia with a definite wall detach themselves at any point 
externally ; this is comparable with ILI. 
VI. Probable escape of the distal portion of the zoosporangium 
as a coenobium. 
VII. Probable short-lived (as such) ccenobial phase, the cells 
connected by invisible gelatinous matter. 
VIII. Palmella state. 
IX. Gleocystis state. 
X. Botryocystis state. 
And ifto these are added the spheroidal condition of fig. 6, 
the pocketed of the succeeding figure, the ploughshare-like form, 
the lobed form of fig. 14, and lastly the curious mud-studded 
modifications of the wall, we have, as I venture to think, an 
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