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Home > All Images > 1990 > October > 31 Oct 1990

Images Dated 31st October 1990

Choose from 8 pictures in our Images Dated 31st October 1990 collection for your Wall Art or Photo Gift. All professionally made for Quick Shipping.

Section through Yew wood Featured 31 Oct 1990 Image

Section through Yew wood

Light micrograph of a radial longitudinal section through the wood (secondary xylem) of the Yew tree, Taxus baccata, showing the vertical, tube- like structures known as tracheids. In softwoods, like yew, these carry out both sap-conducting and mechanical functions. Dark hair-like spirals of secondary thickening are visible on the walls of the tracheids. These serve to strengthen the cell walls. They are laid down while the xylem is still elongating and the spiral pattern allows the cells to stretch longitudinally. The white dots are holes known as pits. They allow sap to flow between adjacent cells. Magnification: x200 at 35mm size