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Originally Posted by D Mc  There were no wrong statements made in our previous posts. If you will go to Post #74, click on the Tree Decay pdf, please note the author is Shigo. To understand this subject, please read the entire pdf. However, at least go to Patterns of Compartmentalization and Successions, (found in the Table of Comments) find figures 40 and 41. Both of these plates show injuries that did not seal, yet Wall 4 is shown. So I can say with confidence that Wall 4 will do it's thing whether the wound seals or not.
Next follow the path of the red marker for Wall 4 and notice just how far beyond, above, below and around the circumference of the tree it has spread. This did not happen in the blink of an eye but took quite some time. During the time before the farther most cells changed to Wall 4, they were functioning as normal cells, so I can say with confidence, Wall 4 does not require callus growth to exist. But without looking at the entire tree, these comments might not have made sense. |
The diagrams only show wall4 where there is new cells, it is derived from new cells. Whether the new wood growth seals the entire surface or not is irrelevant, fact is the wall4 cells are part of that growth.
It spreads in the vertical plane because the tree grows outwards in the vertical plane too, it's a big cylinder.
Again, where there is no new growth there is no wall4.