DISEASES OF TAXODIUM AND LIBOCEDRUS. 31 
peckiness in the latter extended upward into two main 
branches for 20 ft. At the points where all recognizable 
traces of the disease ceased, the branches had about 150 
annual rings. A third tree was sound for 60 ft. from the 
base, then became very pecky, the peckiness passing up 
into two or three main branches, and still another was pecky 
3 ft. from the base #ad upward. The extent of peckiness 
varies, i. e., in one trunk the holes may be several inches 
apart, or scattered all over the cross-section, in another they 
may be confined to the first 150 rings. Nowhere was a 
single tree seen hollow, at least none which was hollow be- 
cause of an advanced stage of peckiness. In this respect 
this disease affects the cypress just as Trametes Pint does 
the pines. One never finds a pine hollow because of 
disintegration caused by Trametes Pini. This is especially 
to be noted, as it will be referred to again. It is a notice- 
able fact that in traveling through cypress forests one 
rarely sees many fallen trees, and where violent wind- 
storms have overthrown any number of trees, these are just 
as often trees sound at the base as those which are diseased. 
In the fall the whole tree falls, i. e., the trunk does not 
break, as do many pines and deciduous trees, in which the 
entire heartwood may have been destroyed, by such a para- 
site as Polyporus sulphureus. The oldest trees e. g., in 
which about 1800 rings were counted (southern Louisiana), 
have the same appearance as those but 200-300 years in age. 
STRUCTURE OF DISEASED Woop. 
The wood of Taxodium is composed of tracheids with 
one or two rows of pits. The growth rings are rather broad, 
the summer wood about one-third the width of the spring 
wood. Resin passages are wholly wanting, and in their 
stead there are numerous resin cells either scattering or in 
tangential bands.* The amount of resin in the wood is 
* Penhallow, D. P. The generic characters of the N. A. Taxaceae and 
Coniferae. (Trans. Roy. Soc. Canada ii. 2:51. 1896.) 
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