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Diffuse-Porous - Diffuse-porous trees (trees with diffuse porous wood) such as maple, birch, poplar and cherry, are angiosperms which have vessels of about equal size and diameter arranged at about equal distances from each other throughout the growth increment. Diffuse-porous wood has vessels, parenchyma, and fibers of about the same size arranged equally throughout the entire growth increment. Such vessel anatomy permits moderate loading throughout the entire growing season, i.e., loading of free water and essential elements dissolved in it. There are four basic types of wood, ring porous, diffuse porous, (simi diffuse), conifer without resign ducts and conifers with resign ducts. And then there are palms.

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See TREE ANATOMY, SHIGO, 1994