CHROMOGENIC FUNGI WHICH DISCOLOR WOOD. 99 



other, or either of them from //. cladosporioides. The 

 description of our fungus might fit any of the three, but 

 as the last named species is the older, its name will hold 

 valid. 



The following cultural characters were obtained from a 

 large number of cultures on agar media, most of which 

 were made from pine-decoction alone, or from the juices of 

 vegetables combined with a pine-decoction: — 



Mycelium. 



Conidia sown on agar plates germinate and produce 

 small, gray colonies visible to the eye in 24 hours. In 

 three to four days the colonies begin to send up erect 

 sporophores, bearing clusters of short septate branches, 

 which are often branched again and from the ends of 

 which branched chains of olive-colored conidia are formed 

 (pi. 10, f. 1). The younger portions of the colony 

 assume a yellow-green color, which rapidly changes to an 

 olive, and finally to an almost black color, while the sur- 

 face has a velvety appearance. The filaments are coarsely 

 granular in the older portion, and are often constricted at 

 the point of septation. They measure 2 to 8^tin diameter. 

 The sporophores measure 100/^ to 400yu. in length, and 3/j> 

 to 4/u, in diameter; the branches are 1- to 2- rarely 3- sep- 

 tate, and measure 6/a to 15/l* by Sfi to o/jl. 



Conidia. 



The conidia are borne in simple chains of 2 to 6, rarely 

 more ; they are not granular or guttate except when old, 

 and vary in shape from a blunt to a pointed oval. They 

 measure S/m to Ifx by 2/^ to 4//. When mature, both the 

 hvphal branches and the conidia are of a dark olive color. 



The work of Planchon* indicates that Hormodendron 



* Planchon, Louis. Influence de divers milieux chimiques sur quel- 

 ques champignons du groupe des Dumati6es. Annales des Sciences 

 Naturelles. Botanique. 11: 1-256. pi. 1-4. (1900). 



