50 MISSOURI BOTANICAL GARDEN. 
in diseased wood of Libocedrus decurrens. At a one of 
the attachment organs has formed a branch. These organs 
adhere very firmly to the walls against which they are 
pressed; from the curved form of the hypha one is led to 
suppose that the pressure exerted by the hypha must be 
considerable. The reason for supposing these brown 
hyphae to be saprophytic is that they are usually found 
somewhere in the wood near a knot hole, where there is 
abundant opportunity for the entrance of saprophytes. 
In many cases a form of mycelium with very thick walls 
occurs. This has few clamp connections and forms thick 
felts in the holes. This was found only in logs after they 
had been cut, so there is some reason for considering it as 
foreign to the disease. The great age of many of the cypress 
trees, and the consequent presence of numerous places where 
branches have been broken off, allows many fungi to get in 
which live on the dead and decaying wood, but which seem to 
have nothing to do with the peckiness. Their presence makes 
the study a difficult one at times, especially as they seem to 
grow rapidly and fructify readily. Thus a number of spore 
forms were met with, but in no case could these be brought 
into any connection with the colorless mycelium. One 
form was found very often (PI. 5, fig. 5) also frequently 
present in diseased wood of Libocedrus decurrens and Juni- 
perus Virginiana. The spores are almost round, about 
1 » in diameter, brown, with a distinct wall and a central 
shining body which is not affected by reagents. Many of 
the spores have short knobs. The spores occur in such 
numbers in the wood around the holes that it seems proba- 
ble that they were formed in chains and may be considered 
chlamydospores. A number of times chains of two or 
three were found with fine remnants of hyphae attached. 
These spores were placed in cultures of dung, cypress agar, 
and gelatin, but have so far refused to germinate. It is 
possible that they represent some form of entophytic 
organism (Chytridiaceae ? Phytomyxae?) studied by 
28 
