90 MISSOURI BOTANICAL GARDEN. 



3.5/1 to 4.5/x by 1.4/a to 2//. 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 Grafhium 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 suffi- 

 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. eumorphum and G. alrovirens. 



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 



