Abstract
In the present paper, an attempt is made to determine the effect of decay durability against wood-rotting fungi in old wood. The samples of the test are all HINOKI Chamaecyparis obtusa ENDLICHER, and comprise nine kinds of old woods and two kinds of new ones. The old woods have been used in ancient Japanese temples, as constructional members of their respective buildings, and range from about 350-1, 300 years in age. The mechanical and chemical properties of these samples have been explained in the previous reports of this series.
The fungi used in the test are as follows:
a) Lignin-dissolving fungus: Trametes sanguinea,
b) Cellulose-dissolving fungi: Gloeophyllum subferrugineum and FormitoPsis pinicola.
The test were held under the controlled laboratory condition at 28°C and continued for 120 days duration.
The results of test are shown in Table 2 and Figures 1 A, 1 B, and 1 C. Taking the observation with Poria Vaporaria by Soshiroda into consideration, it is concluded that the decay durabilities of old wood compared with new wood, differ with the species of wood-rotting fungi.
