MISSOURI BOTANICAL GARDEN. 



in the catalogue of Pacific Coast fungi which records 

 Daedalea vorax on Libocedrus (1. c.) is an error, and that 

 instead of Libocedrus it ought to read Abies Douglasii. 

 Mayr's statement is therefore the only one ascribing this 

 disease of Libocedrus to Daedalea vorax, for the note in 

 the Silva was based on the statements of Harkness 

 and Mayr. In view of the fact that Mayr's report has 

 never been confirmed I am inclined to the belief that 

 Daedalea vorax has nothing to do with the decay of 

 Libocedrus. This would leave the identify of the fungus 

 which is responsible for this trouble as obscure as in the 

 case of Taxodium distichum. 



CHARACTER OF THE DISEASE. 



Specimens of diseased wood received from various parts 

 of California and Oregon have the appearance shown in 

 Plate 2. The heartwood is full of lens-shaped cavities 

 filled with a very brittle brown material. The latter is evi- 

 dently the wood which formerly filled the cavity, but has 

 been changed and has shrunken considerably. The cavities 

 are placed irregularly in the wood with their longest diam- 

 eter parallel to the wood cells. They vary considerably in 

 size, from 1 inch long and \ inch wide to 10 inches long 

 and 1J inches wide. In the majority of cases the separate 

 cavities do not communicate with one another, but occa- 

 sionally they do, as is evident from the cavities at the right 

 side of the figure. The line of demarkation between sound 

 wood and the brown decayed wood is a very sharp one. 

 When the decayed wood is removed, the cavities have a 

 sharply-defined, smooth bounding surface. In most 

 respects the appearance of the wood is like that of diseased 

 Taxodium wood. 



OCCURRENCE. 



Concerning the prevalence and mode of occurrence of 

 this disease, only such facts can be given as were learned 

 from correspondents particularly from Dr. Harkness, 

 46 



