in Anatomy of Flowering Plants by

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The wood  which has the vessels in the xylem is known as the porous wood. it is commonly found in the angiospermic wood. The porous wood is also known as the hard wood.

Whereas the wood in which vessels are not found is called as the non porous wood. Such type of wood is found in the gymnospermic plants.The non porous wood is also known as the soft wood.

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