CHROMOGENIC FUNGI WHICH DISCOLOR WOOD. 95 



from the previous species was found on discolored boards 

 made from the white pine, Pinus Strobus L. This stained 

 the wood a light brown color, less intense than that made 

 by any other species of Graphium investigated, with the 

 exception of G. eumorphum. The constant presence of 

 short chains in the formation of the secondary conidia was 

 a character that needed the most careful verification, since 

 it was possible that an admixture of Ceratostomella with 

 the Graphium had taken place. This form of conidia was 

 accepted as a fact only after careful study for six months, 

 with repeated dilution cultures of both primary and second- 

 ary conidia in numerous agar poured plates and test tube 

 cultures. 



Another difficulty lay in the resemblance of the fungus 

 to species of Stilbum, the stroma in its earliest stages 

 being identical with species of this genus, owing to the ab- 

 sence of color. The same difficulty is to be found with 

 others of the species studied. This indicates that the sep- 

 aration of Graphium from Stilbum on a color basis is not 

 a good one, and that there is no good dividing line between 

 the two genera. Should it be found that species of Stil- 

 bum have secondary conidia similar to those of Graphium, 

 a better basis for generic separation would be found in the 

 types of such conidia. 



The following are the cultural characters of this species 

 which is now named Graphium aureum: — 



Mycelium. 



In colonies grown on agar plates either from primary or 

 secondary conidia there appear in two or three days second- 

 ary conidia borne singly or in branched chains from simple, 

 erect conidiophores. These conidia are like those of Sporo- 

 trichum and of Ceratostomella. The mycelium is hyaline 

 at first, changing to yellow, then to light brown. The fila- 

 ments measure from 2/j- to 3/x in diameter. 



