CHROMOGENIC FUNGI WHICH DISCOLOR WOOD. 89 



2/.c in diameter. The color of the stroma is dark green to 

 black when mature, but in growing colonies all variations 

 between hyaline and dark green may be found. The 

 stalks measure from 1.5 mm. to 3 mm. in height, and 8//. 

 to 80/u. in diameter, being proportionately more slender 

 than those of every other species of Graphium described 

 in this paper (pi. 8, f. 1). In this species, as in others, all 

 the forms of gradation between a head with a stalk com- 

 posed of one filament, and a stalk with many filaments may 

 be found. The difference between those bearing secondary 

 conidia and those bearing primary conidia consists mainly 

 in the absence of color in hyphae bearing the former. 



Secondary Conidia. 



The secondary conidia are borne in simple open clusters, 

 of the type of the conidia of Sporotrichmn. They are 

 borne either terminally or along the sides of lengthened 

 hyphae (pi. 8, f. 2, 3). They are obovate to elliptical in 

 shape, measuring 4,u to 5.5/i by 1.6/x to 2/x. They are 

 hyaline, becoming guttulate when old. The clusters re- 

 main open for a number of days after they are mature, but 

 under very moist conditions fall together in rounded masses 

 on the hyphae. The conidia of G. smaragdinum fall to- 

 gether as soon as mature, the clusters being much closer in 

 their formation (pi. 9, f. 9). 



Primary Conidia. 



The primary conidia are borne terminally on the ends of 

 the branching hyphae in the stroma which form large, 

 mucilaginous heads. These, without the sheath of mucus, 

 are flattened oval in shape, (pi. 8, f. 1), white at first, 

 later gray in color. They measure 40 /jt to 600/* in their 

 greatest diameter, the latter being the measure of the 

 head including the mucilaginous sheath. The primary 

 conidia are hyaline, obovate to elliptical, and measure 



