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90 MISSOURI. BOTANICAL GARDEN. 
8.52 to 4.54 by 1.44 to 24. The stalks in this species 
bearing the primary conidia are sometimes much branch- 
ed, but this feature is dependent more upon the culture 
medium and physical conditions than upon the inherent 
specific tendencies. One difference between the stalks of 
this species and those of G. smaragdinum is that in the 
case of the latter they tend to be gregarious, and are more 
apt to be swollen at the base. 
B. Species oF GRAPHIUM WITH A SECONDARY CONIDIAL 
STAGE UNLIKE SPOROTRICHUM. 
1. Species with secondary conidia borne continuously and 
terminally, falling at once into clusters. 
Under this subdivision will fall at least two species, 
Graphium smaragdinum and G. rigidum. <A third species 
is still under culture but the work has not progressed sufti- 
ciently for identification. 
It is a very difficult matter to determine the manner in 
which the secondary conidia are borne in these species, be- 
cause as rapidly as the conidia are formed by abstriction 
from the end of simple or branched hyphae they break off 
and cling closely to the ends of the hyphae, being enveloped 
in a thin coating of water or soluble mucilage which hides 
the outline of the hyphae and conidia. It is probable that 
there is sometimes more than one conidium attached di- 
rectly to the end of each hyphae branch and that these 
secondary conidia are but modified forms of those de- 
scribed in division A. The conidial masses formed are 
similiar in appearance to those of G. ambrosiigerum, 
G. ewmorphum and G. atrovirense 
It is also quite probable that in all species of Graphium 
the primary conidia are formed in the head precisely as the 
secondary conidia are formed in the open and that the two 
