Simi-Ring or Simi-Diffuse   - Simi-Ring Porous are those trees that start out ring porous but alter to diffuse in the late wood.  There are four basic types of wood, ring porous, diffuse porous,  conifer without resign ducts and conifers with resign ducts.  As always in nature we have variations, we have simi-ring.  And then there are palms.

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See Ring porous and Diffuse porous.

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