84 MISSOURI BOTANICAL GARDEN. 



In the gross appearance of artificial cultures of Graph- 

 ium and of Ceratostomella there is often a striking resem- 

 blance or mimicry. The secondary conidial stage of the 

 former resembles superficially the conidial stage of the lat- 

 ter, and the mucous head of the former that of the perithe- 

 cial stage of the latter at the time the ascospores are ejected 

 in a viscid drop. The mucus surrounding the conidia of 

 Graphium is soluble in water; on the other hand, the jelly- 

 like substance exuded from the perithecia of Ceratostomella 

 is very difficultly soluble in water. Both are well adapted 

 for adhering to the bodies of insects with which they come 

 in contact. 



Perfect or Chaetomium Stage. 



The Chaetomium stage of Graphium observed by Bou- 

 langer has not been found in connection with the species 

 studied ; but as the cultural work on Graphium has not yet 

 been concluded, it is hoped that by the use of the proper 

 culture media some species may finally be stimulated to pro- 

 duce perfect forms, either of Chaetomium or other genera. 



In the consideration of the species of Graphium studied, 

 it is thought best to separate them into the following groups 

 based on the form of fruiting in the secondary conidial 

 stage : — 



A. Species of Graphium with a secondary conidial stage with couidia 



resembling those of Sporotrichum. 



B. Species of Graphium with a secondary conidial stage unlike Sporo- 



trichum. 



1. Species with secondary conidia borne continuously and terminally, 



falling at oace in clusters. 



2. Species with secondary conidia borne either in simple clusters or 



in clusters of short branched chains. 



