. The fungal diseases of the common larch . Larches. 32 THE LARCH CANKER found a similar formation of resin ducts in larch which has been attacked by the sawfly. These comparisons do not support the contention of de Vries (1876) that such wood is the result of reduced tangential pressure produced by a wound, since in two cases the tree was not wounded. Fig. 11.—Radial longitudinal section of abnormal wood: a, summer wood of previous year, abnormal—one cell shows tertiary thickening ; 5, short sclerenchymatous elements ; c, long sclercnchymatous elements ; d, nearly normal xylem. except in its
. The fungal diseases of the common larch . Larches. 32 THE LARCH CANKER found a similar formation of resin ducts in larch which has been attacked by the sawfly. These comparisons do not support the contention of de Vries (1876) that such wood is the result of reduced tangential pressure produced by a wound, since in two cases the tree was not wounded. Fig. 11.—Radial longitudinal section of abnormal wood: a, summer wood of previous year, abnormal—one cell shows tertiary thickening ; 5, short sclerenchymatous elements ; c, long sclercnchymatous elements ; d, nearly normal xylem. except in its crown. We have rather to look for the cause in the reduction of food supply which may be brought about, either by defohation, or by the death of the phloem in the neighbourhood of the developing wood. In the canker the formation of normal wood is resumed only when new phloem has been made outside, which forms. 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 Hiley, W. E. (Wilfrid Edward). Oxford : Clarendon Press
Size: 1441px × 1733px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, bookpublisheroxfor, bookyear1919
