DISEASES OF TAXODIUM AND LIBOCEDRUS. De 
Fischer, Dangeard, De Wildeman and others. Brefeld * 
records an instance of similar spores in Peziza tube- 
rosa. These were constricted off in chains and refused 
to germinate. Hartig ¢t found spores in wood destroyed by 
Polyporus sulphureus. These, he says, belong to some 
saprophytic fungus, always found with Polyporus sulphur- 
eus. In wood of Quercus alba and Q. nigra destroyed by 
Polyporus sulphureus, collected in New York and Arkansas, 
similar spores were found, represented on Pl. 5, fig. 8, for 
comparison. They seem to be constantly present wherever 
Polyporus sulphureus has destroyed oak wood. The asso- 
ciation of these two fungi is not understood as yet, and 
awaits further investigation. 
Besides the brown spores a number of others occur, a 
few of which may be mentioned. One form, large, black 
spores in chains, resembles Willkomm’s ¢ Nenodochus ligni- 
perda (Pl. 5, fig. 7). Another form, consisting of large 
two-celled chlamydospores (Pl. 5, fig. 4), is not infre- 
quent. 
PROGRESS OF THE DISEASE. 
In the early stages of the disease the wood turns yellow 
in localized areas, about + inch wide and extending longi- 
tudinally with the wood fibers for several inches (Pl. 1, 
fig. 1). These areas are separated by intervening layers 
of wood, unchanged in color. In the wood cells of the 
yellow areas numerous hyphae of the colorless mycelium 
are found. The larger hyphae extend longitudinally 
through the cells and give off many branches which pass 
and repass through the walls. The ultimate hairlike 
branches reach every cell in the area. Numerous clamp 
connections are to be seen. Between the yellow areas the 
hyphae extend through the wood cells, passing through the 
* Brefeld, O. Bot. Untersuchungen tiber Schimmelpilze 4; 113. 
+ Hartig, R. Zersetzungserscheinungen, etc. 113. pl. 74. f. 10-12. 
{ Willkomm, M. Die mikroscopischen Feinde des Waldes, pl. JJ. 
f.8. 1866, 
29 
