8 BULLETIN 1037, U. S. DEPARTMENT OF AGRICULTURE. 



Ceratostomella. During the extensive culture work of Hedgcock, 

 however, extending over a period of four or five years and involving 



Fig. 2.— Mycelium and fruiting bodies of " blue-stain " fun- 

 gus : 1, Tangential section of " blue " wood ; 2, cross sec- 

 tion of " blue ■' wood ; 3, cross section of pith ray ; -}, 

 young fruiting body of the " blue-stain " fungus (Cerato- 

 stomella pilifera) ; 5, mature fruiting bodies of the "blue- 

 stain " fungus ; 6, two fruiting bodies of the " blue-stain " 

 fungus ; ~, two spore sacs with spores of the " blue-stain '" 

 fungus ; 8, spores of the " blue-stain " fungus ; 9, top of 

 beak of fruiting body of Ceratostomella pilifera just after 

 the discharge of the spore mass. (After Von Schrenk 



(32), pi. 7.) 



a number of species of Ceratostomella from a variety of sources, no 

 Graphium stage of this fungus was ever reported. 



