DISEASES OF TAXQDIUM AND LIBOCEDRUS. 



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 J Xenodochus ligni- 

 perda (PI. 5, fig. 7). Another form, consisting of large 

 two-celled chlamydospores (PI. 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 hair like 

 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, 0. Bot. Untersuchungen liber Schimmelpilze 4 : 113. 

 t Hartig, K. Zersetzungserscheimmgen, etc. 113. pi. 14. f. 10-12. 

 % Willkomm, M. Die mikroscopischen Feinde des Waldes. pi. II. 

 f. S. 1866. 



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