108 BOTANICAL GAZETTE [AUGUST 
all the species of Lepidostrobus have probably reached the level of 
Selaginella in this feature, or, in other words, that Selaginella is 
the modern representative of this group. In the Lepidostrobus 
form referred to, the microspores are 20u in diameter, and the 
megaspores 800, so that there is no question as to the great 
differentiation in size. The discovery of a Lepidostrobus, therefore, 
which is evidently homosporous is worthy of record and considera- 
tion. If these old strobili included both homosporous and hetero- 
sporous forms, the history of the modern Lycopodiales would 
become simpler. It would also emphasize the independent origin 
of heterospory in lines which could by no possibility be related. 
UNIVERSITY OF CHICAGO 
