Embryo of Botrychium obliquum , MiihL 1 5 5 
The suspensor increases in size and becomes multicellular, but it is not 
quite clear whether this is entirely the result of division in the primary 
suspensor cell or whether the cells of the embryo adjacent to the original 
'suspensor contribute to it. 
The development of the sporophyte was not followed beyond the time 
of the emergence of the cotyledon and primary root. At the time the 
lamina of the cotyledon expands only one root, as a rule, could be seen. 
Some cases were observed (Fig. 5) where a short lateral root had developed 
Text-fig. ii. a. Longitudinal section of the stem apex of a young sporophyte. x 270. 
The large nucleated cell is the apical cell of the stem ; L 2 , L 3 , second and third leaves. 
b. Root apex, x , apical cell, x 270. c. Cross-section of the petiole of the cotyledon, x 70. 
D. Monarch bundle of primary root, x 270. 
from the primary one, but this was probably the result of some injury to 
the apex of the primary root. The bundle of the first root is usually 
diarch, as in B. Lunaria and B. virginianum, and the endodermis is very 
conspicuous (Text-fig. 10, H). Not infrequently, however, one xylem is 
suppressed and the bundle is monarch, as in Ophioglossum vulgatum 
(Text-fig. 11, d). 
While it is common for more than one archegonium to be fertilized, and 
several one- celled embryos are frequently found on a gametophyte, in only 
two cases were two older embryos encountered, and one of these was much 
better developed than the other, indicating that the smaller one would 
