. Annual report of the Agricultural Experiment Station. Cornell University. Agricultural Experiment Station; Agriculture -- New York (State). 242 Bulletin 193. toward the centre by a broad and irregular discolored area. The discolored area is of a light brown color, cind tliis is farther sharply defined from the pale yellowish white area outlined by a narrow black line. The more advanced stages of decay in this maple tree advanced toward the peripliery in separated columns, showing on cross section a radiatino- or digitate fig-ure. The radiations or '•fingers," alternate with dark areas w
. Annual report of the Agricultural Experiment Station. Cornell University. Agricultural Experiment Station; Agriculture -- New York (State). 242 Bulletin 193. toward the centre by a broad and irregular discolored area. The discolored area is of a light brown color, cind tliis is farther sharply defined from the pale yellowish white area outlined by a narrow black line. The more advanced stages of decay in this maple tree advanced toward the peripliery in separated columns, showing on cross section a radiatino- or digitate fig-ure. The radiations or '•fingers," alternate with dark areas which extend inward from the periphery as shown in the photograph. Sometimes this figure is quite regular around a portion of the margin, while other portions are very irregular. The decay of the wood seems to proceed in. 76.— Toung trunk of maple nearly killed by Polyjwrus igniarius. waves from the centre towai'd the periphery, so that there appear several different stages. The outer one is marked by the dark discolored area, the next is pale yellowish white, the wood being (juite soft, and an older and more advanced area at the centre of the heart. These different stages in the process of decay from the centre to the peripliery are usually limited by the black line, which is bordered l)y a more or less well defined corona of color darker than the area upon wdiicli it is advancing. In. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Cornell University. Agricultural Experiment Station. Ithaca, N. Y. : The University
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