68 MISSOURI BOTANICAL GARDEN. 
in the catalogue of Pacific Coast fungi which records 
Daedalea vorax on Libocedrus (1. ¢.) 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 identity 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 14 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 
