ON THE DEVELOPMENT OF LICHENOPORA VERRUCARIA. 109 
to degenerate and to be replaced by a new one. The brown 
body which is found in connection with the developing embryo 
is alluded to in this paper as the fertile brown body. 
The exact origin of the cells forming the embryonic invest- 
ments could not be made out, but I feel confident that they 
are not formed as a modification of an ordinary polypide-bud. 
They appear to me to be differentiated in situ from the cells 
of the funicular tissue which surround the egg, aided probably 
by the cells which form the capsule of the fertile brown body. 
On two occasions I have, however, found young colonies in 
which the appearances could be interpreted by supposing that 
a polypide-bud was concerned in the production of the struc- 
tures connected with the embryo. I have come to the conclu- 
sion that such a view would be erroneous ; and I regard the 
colonies in question as really belonging to Stage D, although 
they have reached that stage rather precocicusly. 
Stage C.—‘‘Suspensor Stage,’ with Brown Body and 
Polypide. 
I have ventured to call this stage by a name taken from the 
development of the embryo in a flowering plant, in conse- 
quence of the resemblance of a cord of cells supporting the 
embryo to the structure known to botanists as the suspensor. 
By this term I refer to the inner cord of cords (figs. 23, 24) 
which is contained in an investment continuous with the cells 
which immediately surround the embryo. ‘These cells, which 
enclose the embryo, may be termed the “follicle ” (fig. 24). 
The whole set of structures which are developed in imme- 
diate relation with the embryo form the “‘embryophore,” a 
structure which has been seen at a later stage of development 
in fig. 11 (cf. p. 94). 
The general appearance of the embryo, with its embryonic 
membranes, at this stage, may be gathered from fig. 10, repre- 
senting part of the fertile polypide in a colony which is about 
‘67 mm. long. The colony possesses in all about nine brown 
bodies, one of which is accompanied by a polypide-bud, and 
