I* 



CHROMOGENIC FUNGI WHICH DISCOLOR WOOD. 61 



ters, parallel cultures of related fungi have been grown on 

 sets of the same media in conditions as nearly identical as 

 can obtain in an ordinarily well-equipped bacteriological 

 laboratory. In order to make drawings of the delicate coni- 

 dial stages of some species it was often found necessary to 

 grow the colonies in Petri dishes of thin glass, and study 

 them in the open in the dish, without placing a cover glass 

 over the very .fragile hyphae. 



It is thought best to arrange the results under the fol- 

 lowing groups or heads : — 



WOOD-STAINING FUNGI. 

 I. Wood-bluing fungi. 

 1. Ceratostomella. 



II. Wood-blackening and>wood-browuiug fungi. 



1. Graphium. 



2. Hormodendron. 



3. Hormiscium. 



4. Other wood-blackening fungi. 



III. Wood-reddening fungi. 



1. Penicillium. 



2. Fusarium. 



In conclusion of these introductory remarks, grateful 

 mention should be made of the valuable assistance to the 

 work of investigation accruing through the use of the 

 library and other facilities of the Missouri Botanical Gar- 

 den, kindly tendered by Dr. William Trelease, the Direc- 

 tor. Acknowledgment also should be made of the helpful 

 co-operation of Dr. Hermann von Schrenk, Mr. Perley 

 Spaulding and Miss Laura L. Eames, of the Mississippi 

 Valley Laboratory, and to Dr. A. D. Hopkins, of the Bu- 

 reau of Entomology of the United States Department of 

 Agriculture, for securing material for study and granting 

 other similar favors. 



I. WOOD-BLUING FUNGI. 

 The blue stain in pine wood has been known in P^urope for 



