Skip to main content

History: Cross-Section of Tree Trunk

View published page Collapse Into Edit Sessions

Source of version: 6

«
»

{img type="fileId" fileId="92" thumb="box" width="400" desc="Cross-Section of Tree Trunk \"American Woods\" by Schoonover, pg. 8" alt="cross-section of tree trunk" featured="y" align="left"}
A. - __CAMBIUM__.  A very thin layer of living cells lying between the inner bark and sapwood, where the new wood and bark cells develop each year.

B. -  __INNER BARK__.  Serves to carry the food manufactured by the leaves to the cambium layer.

C. -  __OUTER BARK__.  The inner bark gradually transforms into the outer bark, a corky layer of dry dead cells forming a protective covering.

D. -  __SAPWOOD__.  The lighter colored band of wood between the inner bard and darker heartwood. It carries the sap from the roots to the leaves.

E. -  __HEARTWOOD__.  Formed by a gradual change in the sapwood by which it becomes darker, heavier and often more durable. Most trees form heartwood. It is inactive but gives strength to the trunk.

F. -  __PITH__. The soft spongy tissue in the center of the tree trunk and all branches. The pith in some trees is so small it is not discernible without greatly magnifying it.

G. -  __MEDULLARY RAYS__.  Wood rays or medullary rays are very small, flat, vertical bands or ribbon-shaped sheets of tissue (ducts) connecting the pith with the various layers of wood and the inner bark, and by which food and water are stored and transported horizontally in the tree.

H. -  __ANNUAL RING__.  Each year a tree adds an additional layer of wood to is circumference, this layer forming immediately beneath the bark and is called "annual ring" or "growth ring". In the spring the newly formed cells are thin-walled and spongy, called "springwood," while in midsummer and fall the walls of the cells become thicker and more dense, called "summerwood."

History

Enable pagination rows per page

Information	Version
08-30-2019 12:39 admin cat	25			Actions View Source
01-30-2019 04:39 admin image ref	24			Actions View Source
10-10-2018 19:40 admin links	23			Actions View Source
10-07-2018 06:36 admin none	22			Actions View Source
10-07-2018 06:35 admin reference	21			Actions View Source
07-24-2018 21:19 admin added cat	20			Actions View Source
07-16-2018 18:53 admin added biblio	19			Actions View Source
07-13-2018 08:37 admin added reference	18			Actions View Source
07-13-2018 08:36 admin removed biblo	17			Actions View Source
07-13-2018 08:36 admin removed biblo	16			Actions View Source
07-13-2018 08:33 admin biblio	15			Actions View Source
07-08-2018 08:16 admin edit tags	14			Actions View Source
07-08-2018 00:13 admin altered biblio code	13			Actions View Source
07-08-2018 00:10 admin showreference Plugin modified by editor.	12			Actions View Source
07-08-2018 00:08 admin added reference	11			Actions View Source
07-08-2018 00:03 admin none	10			Actions View Source
07-08-2018 00:01 admin added reference	9			Actions View Source
07-07-2018 23:57 admin added biblio	8			Actions View Source
07-07-2018 23:35 admin added headers	7			Actions View Source
07-07-2018 23:30 admin added text	6			Actions View Source
07-07-2018 23:20 admin img Plugin modified by editor.	5			Actions View Source
07-07-2018 23:19 admin added defin	4			Actions View Source
07-07-2018 23:16 admin img Plugin modified by editor.	3			Actions View Source
07-07-2018 23:15 admin img Plugin modified by editor.	2			Actions View Source
07-07-2018 23:13 admin page creation	1			Actions View Source