Biology Pamphlets Volume 1799

Biology Pamphlets Volume 1799

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1900 edition. Excerpt: ...projecting from the medullary ra's, as if they had been pulled out and stretched before being torn. RELATION OF THE 'BLUE-' FUNGUS INFECTION TO THE BEETLE HOLES. As has been previously stated, the first evidences of the presence of the "blue" fungus are seen some weeks after the beetles have bored into the cambium layer. The first signs of blue color in the wood might be expected just under a hole in the bark or near such a hole, or under the tube excavated in the bark extending from such a hole. This, however, is not always the case; in fact, is rarely the case. The small triangular patches of color may appear anywhere within the area attacked by the beetles. Why this should be so it is difficult to explain satisfactorily. The spores must enter the region between the wood and the bark through the beetle holes and burrows, for there is no other way for them to get through the bark. Cracks in the bark are practically entirely wanting in the living trees. The only explanation possible is that the hypha? start their growth in the bark and cambium layer, the parts richest in food materials, and then grow inward at one or more points independent of the beetle holes. As soon as the living bark and wood die, a wood-boring beetle enters the wood and makes numerous small holes all through the sapwood (see PI. IX). It enters felled trees within a few days after the tree is cut. The holes which it makes extend radially into the trunk, sometimes with great directness, then again obliquely. The beetles bore with great rapidity, so that they may have reached the heartwood in the course of a few months. These holes form very convenient channels for the entrance of the hyphie of the "blue' fungus, and they take advantage of their more

Product details

  • Paperback | 30 pages
  • 189 x 246 x 2mm | 73g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236534204
  • 9781236534200