CHROMOGENIC FUNGI WHICH DISCOLOR WOOD. 97 



is imperfectly described. The fungus is now assigned to 

 this species with the following emended description taken 

 from cultural characters : — 



Mycelium. 



The growth of colonies from both primary and secon- 

 dary conidia is much like that of G. aureum. The colon- 

 ies remain hyaline for some time ; even the stalked heads , 

 show an absence of color for several days after their ap- 

 pearance. Finally the mycelium assumes a gray color, often 

 with a green tinge, and at the same time the stromata as- 

 sume a darker color. The filaments measure 2fi to 3/a in 

 diameter. 



Secondary Conidia. 



The secondary conidia are of the type of branching 

 chains, resembling Ceratostomella (pi. 9, f. 2, 3). They 

 are obovate to cylindrical, hyaline, and measure 4/a to 6/* 

 by lit to 2ft. The conidial clusters are open at first, but in 

 moist air fall together after a few days, forming rounded 

 masses on the ends of the hyphae. 



Primary Conidia. 



The stalks bearing the heads are hyaline at first, chang- 

 ing to a gray, finally to brown or black at the base. They 

 are often much swollen at the base, and measure from 

 .3 mm. to 2 mm. in length by 30//. to 300/* in diameter. The 

 heads are large and showy, often much flattened, or even 

 recurved at the edges, and measure 20a to 600/t in width 

 (pi. 9, f. 1). Their color is white at first, changing later 

 to a creamy yellow color. The primary conidia are borne 

 continuously on branched hyphae from the ends of the 

 filaments in the head, falling off rapidly as they are 

 formed, into the mucous mass which surrounds the head. 

 They are hyaline, and measure 3/x to 5/* by l/i to 1.5/* (pi. 

 9, f. 4). 



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