PTERIDOPHYTES 
FlGS. 288-293. Embryo (sporophyte) of Lyco- 
poaium clavatum: 288, first division of egg into sus- 
pensor cell and embryonal cell ; 289, 290, division of 
embryonal cell into four cells (290 being a cross sec- 
tion); 291-293, further stages in the development of 
the embryo. After BRUCHMANN. 
FIG. 294. Young 
sporophyte of Lycopo- 
dium clavatum, show- 
ing foot, primary root, 
and stem bearing 
scale leaves. After 
BRUCHMANN. 
embryo sporophyte, found in certain pteridophytes, as the Lycopo- 
diales, but very characteristic of seed plants 
Phylloglossum 
This is an Australasian genus of one species, closely allied to Lyco- 
podium and thought by some to be the most primitive pteridophyte. 
The sporophyte body is a tuberous stem bearing a cluster of small 
leaves. Some of the sporophytes also develop a short, naked stalk 
bearing a terminal stobilus (fig. 295). Some species of Lycopodium 
begin with this type of body, but the strobilus-bearing stalk becomes 
branching and leafy, and the tuberous embryonic body disappears. 
The adult body of Phylloglossum, therefore, is like the embryonic body 
of some species of Lycopodium. In other species of Lycopodium this 
kind of embryonic body is absent from the life history. The gameto- 
phyte resembles that of Lycopodium, in which there is a subterranean 
