. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 10 BULLETIN 722, V. S. DEPARTMENT OF AGEICULTUEE. acterized in hemlock and grand fir hj its uniformity in occupying the heartwood (figs. 4 and 8). In alpine fir the rot in cross section takes on a somewhat stellar development, due principally to the concentration of the hyphfe along certain of the medullary rays. In badly decayed living trees it is invariably the case that the rot not only occupies the entire heartwood of the trunk but the heartwood of the branches as well (fig. 9), extending in some of the larger ones
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 10 BULLETIN 722, V. S. DEPARTMENT OF AGEICULTUEE. acterized in hemlock and grand fir hj its uniformity in occupying the heartwood (figs. 4 and 8). In alpine fir the rot in cross section takes on a somewhat stellar development, due principally to the concentration of the hyphfe along certain of the medullary rays. In badly decayed living trees it is invariably the case that the rot not only occupies the entire heartwood of the trunk but the heartwood of the branches as well (fig. 9), extending in some of the larger ones a distance of several feet/ causing the formation of sporophores at some distance from the trunk. The advance rot of EcMnodontium tindorium is very difficult of detection and unless accompanied by small brownish discolorations or by reddish or brownishstreaks can not be detected with- out a very close ex- amination. In the early stages of the decay the wood as- sumes a faint yel- lowish, spongy tex- ture. Sometimes this stage is intensified by the presence of small, hardly dis- cernible brownish areaSjWhichlater de- velop into the typi- cal rot. The exten- sion of the advance rot beyond the typi- cal rot varies greatly according to the con- ditions. Some accurate data are at hand to determine the average height of the advance rot beyond the typical rot. Such data wiU be found very useful to scalers in determining the amount of cull to deduct from the gross scale in order to cut out all the advance rot which might later develop into the crumbly decay complamed of by dealers in hemlock lumber. Meinecke ^ states that in the white fir (Abies concolor) of this region the advance rot produced by extends about 2 to 6 feet beyond the typical rot. From the data collected on more than 200 hemlocks of all ages and sizes an exten- sion of 1 to 5 feet has been found to be general. A single figure • Weir, J. R. Destructive eflccts of Trametes pini and Ecliinodontiuin tinctoru
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