Woodworth . — The Apical Cell of Fucits. 207 
in the plane of the section. As in Fig. 1, parallel sections 
show a similar appearance ; and, assuming the sections to 
be of a given thickness in both cases, the characters of A 
in Fig. 2 are not manifest in so many sections as they are 
in Fig. 1. 
A section made across the tip on a plane just below the 
bottom of the depression is shown in Fig. 3. Here is seen 
a series of large cells (in this case seven) A, A', A", etc., the 
central one A being more prominent than the others of the 
series. The cells in the middle of the series have a quad- 
rilateral shape, particularly A. A in this section is the cell 
A of Figs. 1 and 2, and is seen in cross section. A does, 
not stand out here so prominently from the lateral cells, 
because A', A", etc. are cut obliquely because they are in- 
clined to A and not parallel with it, Fig. 2. Surrounding the 
central series there is a compact mass of small irregular cells. 
From the three different sections through the growing-point 
of Fuctts we can come to correct conclusions as to the nature 
of the cells and their relations to one another. The three 
Figures 1, 2, and 3, which represent sections through the 
growing tip of Fuats , were made at right angles to each 
other, and in each section there is seen a single central cell, 
indicated by A in all the figures, which is easily distinguished 
from the surrounding cells by its greater size. On comparing 
the different sections it is evident that this cell is shaped 
like a narrow wedge with convex sides and an obtusely 
rounded apex. 
In different sections through the growing-point there is 
always found one cell larger than any other, and this is 
always situated at the bottom of the terminal depression. 
There is found on either side of the large cell a series of cells 
that become smaller as they are more distant from the central 
one, and in Figs. 1 and 2 they can be traced as becoming 
continuous with the cells of the epidermis. Besides, there 
are smaller cells of irregular shape at the bases of the large 
ones, and from them the hyphae of the stem can be seen to 
take their origin. 
