Forestry in Minnesota 2d Ed Published By the Geological And Natural History
Forestry in Minnesota 2d Ed Published By the Geological And Natural History
Samuel B Samuel Bowdlear Green
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53 Catalpa speciosa Populus balsamifera candicans Juglans cinerea. Picea canadensis Populus tremuloides Populus angustifolia Populus deltoides Pinus strobus Narrowleaf Cotton w'd Cottonwood White Pine A bies balsamea Balsam Fir Picea parryana Blue Spruce A bies concolor White Fir Populus balsamifera Picea engelmanni Balsam Poplar Kngelmann Spruce . . ArborvitEe Thuja occidentalis *Air dried. CHAPTER XIIL DURABILITY OF WOOD. Decay in Wood is due to the breaking down of the tissues by fungi. In s...ome cases the fungus destroys the woody cells;, in others it uses upMhe starch found in the cells and merely leaves a blue stain (bluing of lumber). Some kinds of fungi attack only conifers, others only hard woods; some are confined to one species while others may affect several species, but probably no one of them attacks all kinds of wood. Figure 46 shows the dis- coloration of wood by a shelf fungus. The wood contains the fungus plant, which, when ready to produce its spores, sends out a shelf-like body on the side of the wood.
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