342 The Botanical Gazette. [June, 
a large portion of the cell and the deep red color of the whole 
cell is due to its presence. The nucleus of the spore and of 
the other cells of the plant is not visible in cells untreated 
by reagents and hence is not shown in any of the figures of 
this paper. Figure 1 shows the characteristic form and posi- 
tion of the chromatophore in a freshly attached spore. 
The spore itself after remaining apparently unchanged for 
about twenty-four hours begins to elongate. It extends a 
protuberance at one end; the chromatophore a little later 
takes up its position near the tip of this elongating portion 
and is accompanied by nearly all the cytoplasm of the spore. 
The protuberance is next separated from the original spore 
portion by a transverse wall. At this stage, therefore, the 
sporeling consists of two cells, one a basal almost empty cell, 
the original spore, and the other, somewhat smaller, ellip- 
soidal in form (fig. 2). The original spore cell, which loses 
its chromatophore and a large part of its cytoplasm when the 
new cell is formed, persists for some time, after gradually los- 
ing its contents, as an empty spore-case (figs. 3, 4, 1%; 13). 
rom the newly formed cell there arises in each case, by 
repeated division, a filament of cells branched or unbranched, 
each cell of which is similar to the one from which all have 
originated (figs. 3, 5, 6, etc.). : 
n many cases branches arise while the sporeling 's 
ery young. Fig. 7 shows the first indication of suc 
ranch in the protrusion of the process a. Fig. 8 shows 4 
still 
a 
v 
b 
this sort at a 
The sporeling may also form a flat expansion of cells “ 
branches developing in double rows from the original chain © 
cells as is shown in fig. 9, to which reference has already bee? 
made. This bears a decided resemblance to the more 4° 
vanced structures found at the base of the Nemalion frowd 
attached to the barnacle shells where they grow. ig. ! 
shows one typical plant of this sort, many of which form d 
Spots on the barnacles, suggestive of the similar spots of 
red 
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