1914] THAXTER—ASCHERSONIA 313 
been observed, the specific variations, in so far as I have examined 
them, consisting in minor differences relating to the distribution, 
form, and size of the perithecia, the size of the spore-segments, 
' etc., but since, for the reasons above stated, it seems almost impos- 
sible at the moment to determine them accurately, any further 
account of them must be deferred. 
HARVARD UNIVERSITY 
