CHROMOGENIC FUNGI WHICH DISCOLOR WOOD. 87 



The mycelium penetrates pine and other similar woods 

 through the medullary rays, dissolving the starch. In 

 gum wood, Liquidambar Styraciflua Linn., it penetrates 

 in addition many of the vessels of the wood. As compared 

 with Ceratosomella the penetration is not so rapid, neither 

 is the stain so intense ; but on the other hand it may in 

 time stain wood as deeply. 



Graphium eumorphum Sacc. 



A species of Graphium has been found frequenting the 

 old wood of Rubus strigosus and related species. This 

 was isolated and grown first on wood of several kinds which 

 it was found to stain lightly, then upon agar media. An 

 examination of the cultural characters of the fungus place 

 it readily under Graphium eumorphum Sacc. The follow- 

 ing description gives the principal characters, from both 

 natural and artificial cultures: — 



Mycelium. 



Cultures made from both the primary and the secondary 

 conidia produce a sparse, white mycelium, which soon 

 turns a gray-green, and whose filaments measure from 1//. 

 to 2/jl in diameter. These soon bear numerous conidia of 

 the Sporotric]tum-ty\)Q (pi. 7, f. 2), and about a week 

 later the stromata or st...ked heads of Graphium appear 

 (pi. 7, f. 1). The heads are white, changing to a green 

 or greenish yellow, and measure with the mucilage drop 

 from 30/-1 to 100/a. The stalks vary from a yellow to a 

 dark olive or a brown color, and measure from 300/a to 

 500/x in length, and from 10/a to 40/a in diameter. 



Secondary Conidia. 



The secondary conidia are obovate to elliptical in shape, 

 and average 7.8/x by 3. 4^ (pi. 7, f . 3). They are borne, 



