88 MISSOURI BOTANICAL GARDEN. 



unlike Sporotrichum, on simple erect not prostrate hyphae. 

 This stage nevertheless is apparently identical with Sporo- 

 trichum vellereum Sacc. and Speg. var. grisea Boul. 



Primary Conidia. 



The primary conidia are borne on branching hyphae in 

 stalked heads (pi. 7, f. 5), and average 7.7/u. by 3.4/i. 

 They are of a light green or yellow tint, and are identical 

 in shape and appearance with the secondary conidia. 



Graphium atrovirens n. sp. 



In addition to Graphium smaragdinum on the red gum 

 wood a new species was found present in a number of 

 instances. This discolored the wood with a brown stain, 

 similar to the latter species, and at first was not distin- 

 guished from it, having the same color and appearance in 

 mass ; but after a more careful study of the colonies on 

 agar, different forms of secondary conidia were found 

 pres'nt in two types of colonies, making it necessary to 

 separate this form from G. smaragdinum and giving good 

 reasons to call it a different species. It is now named 

 Graphium atrovirens with the following as its cultural 

 characters: — 



Mycelium. 



The growth of the colonies on agar plates is fluffy, as 

 compared with that of G. smaragdinum. This is due to the 

 formation of strands in the mycelium by the union of a 

 number of parallel filaments, these growing upward and 

 often forming large branching masses, similar to those 

 formed by the mycelium of some species of Cerastosto- 

 mella. The filaments of the mycelium are hyaline at first, 

 later changing to dark green or olive, in the vicinity of the 

 stromata or heads. They measure 3/* to 4,u in diameter. 

 Those which unite to form the stroma usually measure but 



